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Accumulated Other Comprehensive Loss (Notes)
 6 Months Ended
Jun. 30, 2021
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, 2019$(67.8)$8.3 $(59.5)
Amounts reclassified from accumulated other comprehensive loss3.7 — 3.7 
Balance at June 30, 2020$(64.1)$8.3 $(55.8)
Balance at December 31, 2020$(54.5)$0.2 $(54.3)
Amounts reclassified from accumulated other comprehensive loss3.8 — 3.8 
Balance at June 30, 2021$(50.8)$0.2 $(50.5)