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Schedule II (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Trade Accounts Receivable [Member]      
Valuation and Qualifying Accounts and Reserves [Roll Forward]      
Balance at Beginning of Period $ 3.1 $ 1.0 $ 1.1
Additions, Charged to Income 0.8 4.1 1.6
Additions, Other Charges 0.0 0.0 0.0
Deductions from Reserves [1] 1.8 2.0 1.7
Balance at End of Period 2.1 3.1 1.0
Finance Receivables – Long-Term [Member]      
Valuation and Qualifying Accounts and Reserves [Roll Forward]      
Balance at Beginning of Period 0.0 0.6 0.6
Additions, Charged to Income 0.0 0.0 0.0
Additions, Other Charges 0.0 0.0 0.0
Deductions from Reserves [1] 0.0 0.6 0.0
Balance at End of Period 0.0 0.0 0.6
Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts and Reserves [Roll Forward]      
Balance at Beginning of Period 43.0 31.6 22.1
Additions, Charged to Income 17.0 11.4 9.5
Additions, Other Charges 0.0 0.0 0.0
Deductions from Reserves [1] 0.0 0.0 0.0
Balance at End of Period $ 60.0 $ 43.0 $ 31.6
[1] Includes uncollectible accounts written-off.