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Schedule II (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Trade Accounts Receivable [Member]      
Valuation and Qualifying Accounts and Reserves [Roll Forward]      
Balance at Beginning of Period $ 1.7 $ 2.1 $ 3.1
Additions, Charged to Income (0.1) 0.9 0.8
Additions, Other Charges 0.0 0.0 0.0
Deductions from Reserves [1] 0.7 1.3 1.8
Balance at End of Period 0.9 1.7 2.1
Finance Receivables – Long-Term [Member]      
Valuation and Qualifying Accounts and Reserves [Roll Forward]      
Balance at Beginning of Period 0.0 0.0 0.0
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 0.0 0.0
Balance at End of Period 0.0 0.0 0.0
Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts and Reserves [Roll Forward]      
Balance at Beginning of Period 66.5 60.0 43.0
Additions, Charged to Income 3.5 6.5 17.0
Additions, Other Charges 0.0 0.0 0.0
Deductions from Reserves [1] 0.0 0.0 0.0
Balance at End of Period $ 70.0 $ 66.5 $ 60.0
[1]
Includes uncollectible accounts written-off.