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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Notes)
 12 Months Ended
Dec. 31, 2021
Statement of Other Comprehensive Income [Abstract]  
Accumulated Other Comprehensive Loss [Text Block]
ACCUMULATED OTHER COMPREHENSIVE LOSS
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)