Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (991.7)	$ (1,223.6)	$ (1,201.7)
OCI before reclassifications	133.7	120.6	(80.2)
Amounts reclassified from AOCI	132.8	111.3	58.3
Net current-period OCI	266.5	231.9	(21.9)
Ending balance	(725.2)	(991.7)	(1,223.6)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	26.0	21.2	9.8
OCI before reclassifications	(18.3)	4.8	11.4
Amounts reclassified from AOCI	0.0	0.0	0.0
Net current-period OCI	(18.3)	4.8	11.4
Ending balance	7.7	26.0	21.2
Tax expense for the recognition of a stranded deferred tax balance arising from deferred tax valuation allowances that was associated with certain postretirement medical benefits due to plan termination		6.4
Post- retirement benefit plans [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(947.7)	(1,119.9)	(1,083.1)
OCI before reclassifications	117.9	118.3	(99.3)
Amounts reclassified from AOCI	93.7	53.9	62.5
Net current-period OCI	211.6	172.2	(36.8)
Ending balance	(736.1)	(947.7)	(1,119.9)
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	(64.9)	(55.5)	(76.6)
OCI before reclassifications	(25.2)	(9.4)	21.1
Amounts reclassified from AOCI	20.0	0.0	0.0
Net current-period OCI	(5.2)	(9.4)	21.1
Ending balance	(70.1)	(64.9)	(55.5)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	26.0	21.2	9.8
OCI before reclassifications	(18.3)	4.8	11.4
Amounts reclassified from AOCI	0.0	0.0	0.0
Net current-period OCI	(18.3)	4.8	11.4
Ending balance	7.7	26.0	21.2
Derivatives [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	5.1	2.1	(0.5)
OCI before reclassifications	41.0	11.7	(2.0)
Amounts reclassified from AOCI	(32.6)	(8.7)	4.6
Net current-period OCI	8.4	3.0	2.6
Ending balance	13.5	5.1	2.1
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	15.8	(50.3)	(41.5)
OCI before reclassifications	0.0	0.0	0.0
Amounts reclassified from AOCI	51.7	66.1	(8.8)
Net current-period OCI	51.7	66.1	(8.8)
Ending balance	67.5	15.8	(50.3)
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