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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable      
Valuation and Qualifying Accounts and Reserves      
Balance at beginning of period $ 0.5 $ 1.1 $ 0.7
Charged to costs and expenses     0.6
Deductions/Applications   (0.6) 0.2
Balance at end of period 0.5 0.5 1.1
Notes issued under par      
Valuation and Qualifying Accounts and Reserves      
Balance at beginning of period 58.8 60.5 62.2
Charged to costs and expenses 1.9 1.7 1.7
Additions 12.7    
Balance at end of period 69.6 58.8 60.5
Valuation allowance      
Valuation and Qualifying Accounts and Reserves      
Balance at beginning of period 819.1 619.6  
Charged to costs and expenses 277.9 199.5 619.6
Balance at end of period $ 1,097.0 $ 819.1 $ 619.6