Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		$ (1,093.7)	$ (1,014.5)	$ (931.4)
OCI before reclassifications		10.1	(130.4)	(121.7)
Amounts reclassified from AOCI		55.8	51.2	38.6
Net current-period OCI		65.9	(79.2)	(83.1)
Ending balance		(1,027.8)	(1,093.7)	(1,014.5)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		9.7	19.4	25.0
OCI before reclassifications		7.6	(9.7)	(5.6)
Amounts reclassified from AOCI		0.0	0.0	0.0
Net current-period OCI		7.6	(9.7)	(5.6)
Ending balance		17.3	9.7	19.4
Post- retirement benefit plans [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(965.5)	(951.2)	(931.5)
OCI before reclassifications		(32.5)	(60.6)	(69.6)
Amounts reclassified from AOCI	[1]	43.5	46.3	49.9
Net current-period OCI		11.0	(14.3)	(19.7)
Ending balance		(954.5)	(965.5)	(951.2)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		0.0	0.0	0.0
OCI before reclassifications		0.0	0.0	0.0
Amounts reclassified from AOCI		0.0	0.0	0.0
Net current-period OCI		0.0	0.0	0.0
Ending balance		0.0	0.0	0.0
Currency translation adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(85.0)	(47.6)	(16.2)
OCI before reclassifications		31.5	(37.4)	(31.4)
Amounts reclassified from AOCI	[2]	0.0	0.0	0.0
Net current-period OCI		31.5	(37.4)	(31.4)
Ending balance		(53.5)	(85.0)	(47.6)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		9.7	19.4	25.0
OCI before reclassifications		7.6	(9.7)	(5.6)
Amounts reclassified from AOCI	[2]	0.0	0.0	0.0
Net current-period OCI		7.6	(9.7)	(5.6)
Ending balance		17.3	9.7	19.4
Unrealized holding gains on securities [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		0.0	0.0	0.0
OCI before reclassifications		0.0	0.0	0.0
Amounts reclassified from AOCI	[2]	0.0	0.0	0.0
Net current-period OCI		0.0	0.0	0.0
Ending balance		0.0	0.0	0.0
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		0.0	0.0	0.0
OCI before reclassifications		0.0	0.0	0.0
Amounts reclassified from AOCI		0.0	0.0	0.0
Net current-period OCI		0.0	0.0	0.0
Ending balance		0.0	0.0	0.0
Derivatives [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		2.4	(15.7)	16.3
OCI before reclassifications		11.1	13.2	(20.7)
Amounts reclassified from AOCI	[3]	(4.5)	4.9	(11.3)
Net current-period OCI		6.6	18.1	(32.0)
Ending balance		9.0	2.4	(15.7)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		0.0	0.0	0.0
OCI before reclassifications		0.0	0.0	0.0
Amounts reclassified from AOCI		0.0	0.0	0.0
Net current-period OCI		0.0	0.0	0.0
Ending balance		0.0	0.0	0.0
Accumulated Deferred Tax Asset Valuation Allowance [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(45.6)	0.0	0.0
OCI before reclassifications		0.0	(45.6)	0.0
Amounts reclassified from AOCI		16.8	0.0	0.0
Net current-period OCI		16.8	(45.6)	0.0
Ending balance		(28.8)	(45.6)	0.0
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		0.0	0.0	0.0
OCI before reclassifications		0.0	0.0	0.0
Amounts reclassified from AOCI		0.0	0.0	0.0
Net current-period OCI		0.0	0.0	0.0
Ending balance		$ 0.0	$ 0.0	$ 0.0

[1] Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 11).

[2] No amounts were reclassified to earnings.

[3] Amounts related to the effective portion of the derivatives are included in cost of goods sold in the period or periods the hedged item affects earnings. Amounts related to the ineffective portion of the derivatives are presented in selling and administrative expenses on the consolidated statements of operations (see Note 9).