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Income Taxes Deferred Income Tax Asset and Liability Components - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Valuation Allowance [Line Items]    
Net deferred income tax liabilities $ 95.9 $ 135.1
Accrued Income Taxes 13.3  
Income taxes receivable 0.0 1.5
Gross domestic state net operating loss carryforwards 104.0  
State tax credits 1.9  
Gross state net operating loss carryforwards and state tax credits, deferred tax asset 6.8  
State net operating loss carryforwards, valuation allowance 4.8 $ 4.5
Deferred Tax Asset, Loss Carry Forwards    
Valuation Allowance [Line Items]    
State net operating loss carryforwards, valuation allowance $ 4.8