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Quarterly report pursuant to Section 13 or 15(d)

SHAREHOLDERS' EQUITY (Details of Accumulated Other Comprehensive Income (Loss) Components) (Details)

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SHAREHOLDERS' EQUITY (Details of Accumulated Other Comprehensive Income (Loss) Components) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Ìý Ìý Ìý Ìý $ 0.1 Ìý
Reclassification out of Accumulated Other Comprehensive Income [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 0.0 Ìý $ 0.0 Ìý (0.1) $ 0.0
Net loss reclassified from accumulated other comprehensive income (loss) 6.5 Ìý 6.5 Ìý 12.6 12.9
Realized Gain Loss On Derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Amount of gain/(loss) recognized in income on derivative 0.0 Ìý 0.0 Ìý (0.1) 0.0
Accumulated Defined Benefit Plans Adjustment [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Net loss reclassified from accumulated other comprehensive income (loss) 6.5 $ 6.2 6.5 $ 6.4 Ìý Ìý
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Prior service credits (0.1) Ìý (0.1) Ìý (0.4) (0.2)
Net actuarial loss 6.6 Ìý 6.6 Ìý 13.1 13.1
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax $ 6.5 Ìý $ 6.5 Ìý $ 12.7 $ 12.9