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Annual report pursuant to Section 13 and 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS PENSION AND OTHER POSTRETIREMENT BENEFITS (Obligations and Funded Status) (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS PENSION AND OTHER POSTRETIREMENT BENEFITS (Obligations and Funded Status) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Employer contributions $ 3.7 $ 3.8 Ìý
Non-current liabilities (311.5) (248.7) Ìý
Pension Plan [Member] Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Benefit obligations - beginning of year 905.7 973.1 Ìý
Service cost (excluding expense) 17.3 18.7 $ 17.1
Interest cost 34.9 30.3 30.5
Plan Amendments 0.0 2.2 Ìý
Actuarial (gain) loss 111.8 (57.0) Ìý
Benefits paid (62.2) (60.7) Ìý
Participant contributions 0.0 0.0 Ìý
Other 13.6 (0.9) Ìý
Benefit obligations - end of year 1,021.1 905.7 973.1
Fair value of plan assets — beginning of year 687.2 749.8 Ìý
Actual return on plan assets 98.1 (29.6) Ìý
Participant contributions 0.0 0.0 Ìý
Employer contributions 16.4 27.6 Ìý
Benefits paid (62.2) (60.7) Ìý
Other 9.4 0.1 Ìý
Fair value of plan assets — end of year 748.9 687.2 749.8
Funded (Unfunded) Status (272.2) (218.5) Ìý
Assets for Plan Benefits, Defined Benefit Plan 0.0 0.0 Ìý
Current liabilities (0.5) (0.1) Ìý
Non-current liabilities (271.7) (218.4) Ìý
Total amount recognized (272.2) (218.5) Ìý
Net actuarial loss 382.1 330.1 Ìý
Prior service cost (credit) 7.3 8.5 Ìý
Net amount recognized 389.4 338.6 Ìý
Other Postretirement Benefits Plan [Member] Ìý Ìý Ìý
Defined Benefit Plan Disclosure [Line Items] Ìý Ìý Ìý
Benefit obligations - beginning of year 241.9 265.9 Ìý
Service cost (excluding expense) 1.7 2.2 1.8
Interest cost 9.5 8.3 8.3
Plan Amendments 0.0 12.8 Ìý
Actuarial (gain) loss 18.9 (29.4) Ìý
Benefits paid (25.6) (24.4) Ìý
Participant contributions 5.8 5.6 Ìý
Other 2.3 0.9 Ìý
Benefit obligations - end of year 254.5 241.9 265.9
Fair value of plan assets — beginning of year 240.2 262.5 Ìý
Actual return on plan assets 35.1 (8.2) Ìý
Participant contributions 0.5 0.5 Ìý
Employer contributions 2.5 3.0 Ìý
Benefits paid (18.6) (17.6) Ìý
Other 0.0 0.0 Ìý
Fair value of plan assets — end of year 259.7 240.2 $ 262.5
Funded (Unfunded) Status 5.2 (1.7) Ìý
Assets for Plan Benefits, Defined Benefit Plan 48.5 32.1 Ìý
Current liabilities (3.5) (3.5) Ìý
Non-current liabilities (39.8) (30.3) Ìý
Total amount recognized 5.2 (1.7) Ìý
Net actuarial loss 72.6 82.1 Ìý
Prior service cost (credit) (7.9) (9.9) Ìý
Net amount recognized $ 64.7 $ 72.2 Ìý