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Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS PENSION AND POST RETIREMENT BENEFITS (Components of Accumulated Other Comprehensive Loss (Income) (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS PENSION AND POST RETIREMENT BENEFITS (Components of Accumulated Other Comprehensive Loss (Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax $ 50.8 $ 11.1
Actual returns on assets (over) under estimate (43.5) 89.6
Amortization of net actuarial loss (23.5) (21.2)
Amortization of prior service credit (cost) (1.2) (2.2)
Current year prior service cost 0.0 2.2
Other 7.2 (0.3)
Other Postretirement Benefits Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax (7.5) 9.5
Actual returns on assets (over) under estimate (18.3) 26.6
Amortization of net actuarial loss (5.1) (5.0)
Amortization of prior service credit (cost) 2.0 3.0
Current year prior service cost 0.0 12.8
Other (5.0) 1.5
Change in Assumptions for Defined Benefit Plans, Discount Rates [Member] | Pension Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax 105.8 (75.7)
Change in Assumptions for Defined Benefit Plans, Discount Rates [Member] | Other Postretirement Benefits Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax 25.5 (19.0)
Change in Assumptions for Defined Benefit Plans, Demographic [Member] | Pension Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax 12.3 21.7
Change in Assumptions for Defined Benefit Plans, Demographic [Member] | Other Postretirement Benefits Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax 3.6 2.3
Changes in Assumptions for Defined Benefit Plans, Mortality [Member] | Pension Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax (6.3) (3.0)
Changes in Assumptions for Defined Benefit Plans, Mortality [Member] | Other Postretirement Benefits Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax (3.9) (0.8)
Changes in Assumptions for Defined Benefit Plans, Per Capita Claims [Member] | Pension Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax 0.0 0.0
Changes in Assumptions for Defined Benefit Plans, Per Capita Claims [Member] | Other Postretirement Benefits Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax (9.4) (11.9)
Changes in Assumptions for Defined Benefit Plans, Other Actuarial (Gain) Loss [Member] | Pension Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax 0.0 0.0
Changes in Assumptions for Defined Benefit Plans, Other Actuarial (Gain) Loss [Member] | Other Postretirement Benefits Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax 3.1 0.0
Changes in Assumptions for Defined Benefit Plans, Actuarial (Gain) Loss [Member] | Pension Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax 111.8 (57.0)
Changes in Assumptions for Defined Benefit Plans, Actuarial (Gain) Loss [Member] | Other Postretirement Benefits Plan [Member] Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý
Other Comprehensive Income (Loss), Defined Benefit Plan, (Gain) Loss Arising During Period, before Tax $ 18.9 $ (29.4)