Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income Components Reclassification [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	$ (461.8)
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	(482.5)	$ (626.1)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(151.1)	(207.1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	500.7	98.2
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(156.1)	23.6
Other Comprehensive Income (Loss), Net of Tax	193.5	(85.3)	$ 379.6
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	2.0	0.5
Accumulated Other Comprehensive Income (Loss) Attributable to Spinoff		228.4
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	195.5	143.6
Accumulated Other Comprehensive Income (Loss), Net of Tax	(287.0)	(482.5)	(626.1)
Foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	(0.7)	37.5
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(73.5)	(41.8)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0.0	0.0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax	(73.5)	(41.8)
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	2.0	0.5
Accumulated Other Comprehensive Income (Loss) Attributable to Spinoff		3.1
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(71.5)	(38.2)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(72.2)	(0.7)	37.5
Pension and postretirement liability adjustment [Member]
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	(481.0)	(663.2)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(80.6)	(166.0)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	501.9	99.0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(155.4)	23.9
Other Comprehensive Income (Loss), Net of Tax	265.9	(43.1)
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	0.0	0.0
Accumulated Other Comprehensive Income (Loss) Attributable to Spinoff		225.3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	265.9	182.2
Accumulated Other Comprehensive Income (Loss), Net of Tax	(215.1)	(481.0)	(663.2)
Defined Benefit Plan, Amortization of Gains (Losses)	(40.1)
Derivative financial instruments fair value adjustment [Member]
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	(0.8)	(0.4)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	3.0	0.7
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(1.2)	(0.8)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(0.7)	(0.3)
Other Comprehensive Income (Loss), Net of Tax	1.1	(0.4)
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	0.0	0.0
Accumulated Other Comprehensive Income (Loss) Attributable to Spinoff		0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1.1	(0.4)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 0.3	$ (0.8)	$ (0.4)