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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts Receivable      
Valuation and Qualifying Accounts and Reserves      
Balance at beginning of period $ 0.9 $ 0.3 $ 0.3
Charged to costs and expenses   0.6  
Deductions/Applications 0.2    
Balance at end of period 0.7 0.9 0.3
Notes issued under par      
Valuation and Qualifying Accounts and Reserves      
Balance at beginning of period 63.8 45.1 46.2
Charged to costs and expenses 1.6 1.5 1.1
Additions   20.2  
Balance at end of period $ 62.2 $ 63.8 $ 45.1