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Variable Interest Entities (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]      
Income Tax Expense (Benefit) $ (1,600,000) $ 13,700,000  
Other Assets 556,000,000.0   $ 575,900,000
Variable Interest Entity, Not Primary Beneficiary      
Schedule of Equity Method Investments [Line Items]      
Variable Interest Entity, Funding Investment Commitment, Funding 48,500,000   20,000,000.0
Distribution of Accumulated Earnings of Equity Method Limited Liability Investments 0   0
Income (Loss) from Equity Method Investments (15,400,000)   0
Income Tax Credits and Adjustments 28,400,000   3,600,000
Income Tax Expense (Benefit) 200,000   $ (400,000)
Cash and Cash Equivalents, at Carrying Value 7,200,000    
Property, Plant and Equipment, Net 54,400,000    
Other Assets 600,000    
Assets 62,200,000    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount $ 54,400,000