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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2021
Accumulated Other Comprehensive Loss [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table summarizes the changes within each component of accumulated other comprehensive loss.
Postretirement Benefit PlansCumulative Translation AdjustmentAccumulated Other Comprehensive Loss
As of December 31, 2018$(131.6)$(243.9)(375.5)
Net change in postretirement benefit plans, net of tax(1.7)— (1.7)
Net foreign currency translation adjustment— (8.1)(8.1)
As of December 31, 2019(133.3)(252.0)(385.3)
Net change in postretirement benefit plans, net of tax77.4 — 77.4 
Net foreign currency translation adjustment— 28.5 28.5 
As of December 31, 2020(55.9)(223.5)(279.4)
Net change in postretirement benefit plans, net of tax15.1 — 15.1 
Net foreign currency translation adjustment— (57.0)(57.0)
As of December 31, 2021$(40.8)$(280.5)$(321.3)