Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income Components Reclassification [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	$ 26.6	$ 461.8
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	(287.0)	(482.5)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(76.2)	(151.1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	47.5	500.7
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(4.6)	(156.1)
Other Comprehensive Income (Loss), Net of Tax	(33.3)	193.5	$ (85.3)
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	(1.7)	2.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(35.0)	195.5
Accumulated Other Comprehensive Income (Loss), Net of Tax	(322.0)	(287.0)	(482.5)
Foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	(72.2)	(0.7)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(32.8)	(73.5)
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	(32.8)	(73.5)
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	(1.7)	2.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(34.5)	(71.5)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(106.7)	(72.2)	(0.7)
Pension and postretirement liability adjustment [Member]
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	(215.1)	(481.0)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(43.2)	(80.6)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	47.2	501.9
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(4.6)	(155.4)
Other Comprehensive Income (Loss), Net of Tax	(0.6)	265.9
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(0.6)	265.9
Accumulated Other Comprehensive Income (Loss), Net of Tax	(215.7)	(215.1)	(481.0)
Defined Benefit Plan, Amortization of Gains (Losses)	(20.6)	(40.1)
Derivative financial instruments fair value adjustment [Member]
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss	0.3	(0.8)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(0.2)	3.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0.3	(1.2)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	0.0	(0.7)
Other Comprehensive Income (Loss), Net of Tax	0.1	1.1
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.1	1.1
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 0.4	$ 0.3	$ (0.8)