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Income Taxes - Net Operating Losses, Credits and Incentives (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Tax Credit Carryforward [Line Items]  
Gross NOLs, Credits and Incentives $ 4,734.7
Portion Subject to a Valuation Allowance 4,722.6
Federal NOLs and credits  
Tax Credit Carryforward [Line Items]  
Gross NOLs, Credits and Incentives 2,112.3
Portion Subject to a Valuation Allowance 2,112.3
State NOLs, credits and incentives  
Tax Credit Carryforward [Line Items]  
Gross NOLs, Credits and Incentives 2,586.4
Portion Subject to a Valuation Allowance 2,586.4
Foreign NOLs  
Tax Credit Carryforward [Line Items]  
Gross NOLs, Credits and Incentives 36.0
Portion Subject to a Valuation Allowance $ 23.9