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Accumulated Other Comprehensive Loss (Notes)
 3 Months Ended
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss, net of tax, is comprised of the following:
Pension Plan AdjustmentsOther Post Retirement Employee Benefit Plan AdjustmentsTotal
Balance at December 31, 2020$(54.5)$0.2 $(54.3)
Amounts reclassified from accumulated other comprehensive loss1.9 — 1.9 
Balance at March 31, 2021$(52.6)$0.2 $(52.4)
Balance at December 31, 2021$(42.8)$0.3 $(42.6)
Amounts reclassified from accumulated other comprehensive loss1.1 — 1.1 
Balance at March 31, 2022$(41.7)$0.3 $(41.4)