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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts Receivable      
Valuation and Qualifying Accounts and Reserves      
Balance at beginning of period $ 0.5 $ 0.5 $ 1.1
Charged to costs and expenses 8.5    
Deductions/Applications (0.2)   (0.6)
Balance at end of period 8.8 0.5 0.5
Notes issued under par      
Valuation and Qualifying Accounts and Reserves      
Balance at beginning of period 69.6 58.8 60.5
Charged to costs and expenses 2.0 1.9 1.7
Additions   12.7  
Balance at end of period 67.6 69.6 58.8
Valuation allowance      
Valuation and Qualifying Accounts and Reserves      
Balance at beginning of period 1,097.0 819.1 619.6
Charged to costs and expenses 246.2 277.9 199.5
Balance at end of period $ 1,343.2 $ 1,097.0 $ 819.1