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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable      
Valuation and Qualifying Accounts and Reserves      
Balance at beginning of period $ 8.8 $ 0.5 $ 0.5
Charged to costs and expenses   8.5  
Deductions/Applications (0.1) (0.2)  
Balance at end of period 8.7 8.8 0.5
Notes issued under par      
Valuation and Qualifying Accounts and Reserves      
Balance at beginning of period 67.6 69.6 58.8
Charged to costs and expenses 2.0 2.0 1.9
Additions     12.7
Balance at end of period 65.6 67.6 69.6
Valuation allowance      
Valuation and Qualifying Accounts and Reserves      
Balance at beginning of period 1,343.2 1,097.0 819.1
Charged to costs and expenses 476.8 246.2 277.9
Balance at end of period $ 1,820.0 $ 1,343.2 $ 1,097.0