Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income Components Reclassification [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	$ 10.2	$ 3.5	$ 10.6	$ 221.0
Other Comprehensive Income (Loss), before Reclassifications, before Tax	3.1	(24.6)	2.3	(112.3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	15.8	13.2	25.8	250.6
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(281.5)	(396.0)	(287.0)	(482.5)
Income tax (benefit) expense	(1.7)	(5.3)	(4.1)	(69.0)
Net current period other comprehensive (loss) income, net of income taxes	17.2	(16.7)	24.0	69.3
Other Comprehensive Income (loss), net of tax, prior to distribution of spinoff	17.2	(16.7)	24.0	69.3
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	(0.5)	1.1	(1.8)	1.6
Accumulated Other Comprehensive Income (Loss) Attributable to Spinoff	16.7	(15.6)	22.2	70.9
Ending Balance	(264.8)	(411.6)	(264.8)	(411.6)
Foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Income Components Reclassification [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	2.2	(30.9)	(1.4)	(52.1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0.0	0.0	0.0	0.0
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(77.1)	(21.4)	(72.2)	(0.7)
Income tax (benefit) expense	0.0	0.0	0.0	0.0
Net current period other comprehensive (loss) income, net of income taxes	2.2	(30.9)	(1.4)	(52.1)
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	(0.5)	1.1	(1.8)	1.6
Accumulated Other Comprehensive Income (Loss) Attributable to Spinoff	1.7	(29.8)	(3.2)	(50.5)
Ending Balance	(75.4)	(51.2)	(75.4)	(51.2)
Pension and postretirement liability adjustment [Member]
Accumulated Other Comprehensive Income Components Reclassification [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	1.4	4.2	6.2	(62.3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	15.3	13.4	25.9	251.3
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(203.1)	(373.5)	(215.1)	(481.0)
Income tax (benefit) expense	(1.7)	(4.6)	(5.1)	(68.5)
Net current period other comprehensive (loss) income, net of income taxes	15.0	13.0	27.0	120.5
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	0.0	0.0	0.0	0.0
Accumulated Other Comprehensive Income (Loss) Attributable to Spinoff	15.0	13.0	27.0	120.5
Ending Balance	(188.1)	(360.5)	(188.1)	(360.5)
Defined Benefit Plan, Amortization of Gains (Losses)			(15.3)	(30.3)
Derivative financial instruments fair value adjustment [Member]
Accumulated Other Comprehensive Income Components Reclassification [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(0.5)	2.1	(2.5)	2.1
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0.5	(0.2)	(0.1)	(0.7)
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(1.3)	(1.1)	0.3	(0.8)
Income tax (benefit) expense	0.0	(0.7)	1.0	(0.5)
Net current period other comprehensive (loss) income, net of income taxes	0.0	1.2	(1.6)	0.9
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	0.0	0.0	0.0	0.0
Accumulated Other Comprehensive Income (Loss) Attributable to Spinoff	0.0	1.2	(1.6)	0.9
Ending Balance	$ (1.3)	$ 0.1	$ (1.3)	$ 0.1