SHAREHOLDERS' EQUITY (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 24, 2014
Stockholders' Equity Note [Abstract]
Authorized share repurchase program (in shares)					8
Stock repurchase program, period in force (in years)	3 years 0 months 0 days
Common stock repurchased and retired (in shares)		(2.5)	(1.5)	(0.2)
Value of common stock repurchased and retired		$ 64.8	$ 36.2	$ 3.1
Total repurchased shares under this program (in shares)	1.9
Remaining shares authorized to be purchased (in shares)	6.1	6.1
Stock options exercised (in shares)		0.5	0.5	0.1
Total value of stock options exercised		12.1	9.7	1.4
Foreign currency translation adjustment [Roll Forward]
Beginning balance		(0.5)	2.1	1.8
Unrealized gains (losses), before Reclassification Adjustments and Tax		(1.8)	(2.6)	0.3
Net Change in Foreign Currency Translation Adjustment		(1.8)	(2.6)	0.3
Ending balance	(2.3)	(2.3)	(0.5)	2.1
Unrealized gains (losses) on derivative contracts (net of taxes) [Roll Forward]
Beginning balance		0.9	4.7	(5.3)
Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax		(10.2)	(7.7)	9.9
Reclassification Adjustment from AOCI on Derivatives, before Tax		1.8	1.4	6.5
Derivatives Qualifying as Hedges, Tax		3.3	2.5	(6.4)
Net Change in Derivatives Qualifying as Hedges		(5.1)	(3.8)	10.0
Ending balance	(4.2)	(4.2)	0.9	4.7
Pension and postretirement benefits (net of taxes) [Roll Forward]
Beginning balance		(365.5)	(378.1)	(290.7)
Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax		(142.0)	(12.5)	(166.8)
Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax		25.5	33.3	23.4
Deferred tax (benefit) provision on pension and postretirement benefits		(45.4)	8.2	(56.0)
Net Change in Pension and Other Postretirement Benefit Plans		(71.1)	12.6	(87.4)
Ending balance	(436.6)	(436.6)	(365.5)	(378.1)
Accumulated other comprehensive loss [Roll Forward]
Beginning balance		(365.1)	(371.3)	(294.2)
Other Comprehensive Income (Loss), Net Gain (Loss) Recognized, Before Tax		(154.0)	(22.8)	(156.6)
Reclassification Adjustment from AOCI, before Tax		27.3	34.7	29.9
Other Comprehensive Income (Loss), Tax		48.7	(5.7)	49.6
Other Comprehensive Income (Loss), Net of Tax		(78.0)	6.2	(77.1)
Ending balance	$ (443.1)	$ (443.1)	$ (365.1)	$ (371.3)