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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance   $ (1,223.6) $ (1,201.7) $ (1,133.8)
OCI before reclassifications   120.6 (80.2) (136.9)
Amounts reclassified from AOCI   111.3 58.3 69.0
Net current-period OCI   231.9 (21.9) (67.9)
Ending balance $ (1,201.7) (991.7) (1,223.6) (1,201.7)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance   21.2 9.8 11.1
OCI before reclassifications   4.8 11.4 (1.3)
Amounts reclassified from AOCI   0.0 0.0 0.0
Net current-period OCI   4.8 11.4 (1.3)
Ending balance 9.8 26.0 21.2 9.8
Tax expense for the recognition of a stranded deferred tax balance arising from deferred tax valuation allowances that was associated with a cash flow hedge portfolio 6.0      
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   (1,119.9) (1,083.1) (1,005.8)
OCI before reclassifications   118.3 (99.3) (141.6)
Amounts reclassified from AOCI [1]   53.9 62.5 64.3
Net current-period OCI   172.2 (36.8) (77.3)
Ending balance (1,083.1) (947.7) (1,119.9) (1,083.1)
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 0.0
Currency translation adjustment [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance   (55.5) (76.6) (73.9)
OCI before reclassifications   (9.4) 21.1 (2.7)
Amounts reclassified from AOCI [2]   0.0 0.0 0.0
Net current-period OCI   (9.4) 21.1 (2.7)
Ending balance (76.6) (64.9) (55.5) (76.6)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Beginning balance   21.2 9.8 11.1
OCI before reclassifications   4.8 11.4 (1.3)
Amounts reclassified from AOCI [2]   0.0 0.0 0.0
Net current-period OCI   4.8 11.4 (1.3)
Ending balance 9.8 26.0 21.2 9.8
Derivatives [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance   2.1 (0.5) (4.8)
OCI before reclassifications   11.7 (2.0) 7.4
Amounts reclassified from AOCI [3]   (8.7) 4.6 (3.1)
Net current-period OCI   3.0 2.6 4.3
Ending balance (0.5) 5.1 2.1 (0.5)
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 0.0
Accumulated Deferred Tax Asset Valuation Allowance        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance   (50.3) (41.5) (49.3)
OCI before reclassifications   0.0 0.0 0.0
Amounts reclassified from AOCI [4]   66.1 (8.8) 7.8
Net current-period OCI   66.1 (8.8) 7.8
Ending balance (41.5) 15.8 (50.3) (41.5)
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 $ 0.0
[1] Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 14).
[2] No amounts were reclassified to earnings.
[3] Amounts related to derivatives are included in cost of goods sold or interest expense in the period or periods the hedged item affects earnings (see Note 12).
[4] Represents the net change in deferred tax asset valuation allowances on changes in AOCI balances between the balance sheet dates. The 2021 income tax provision includes $6.4 million of 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 (see Notes 14 and 17). The 2019 income tax provision includes $6.0 million of tax expense for the recognition of a stranded deferred tax balance arising from deferred tax valuation allowances that was associated with a cash flow hedge portfolio that fully settled in the fourth quarter of 2019.