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Schedule II (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Trade Accounts Receivable [Member]
      
Valuation and Qualifying Accounts and Reserves [Line Items]      
Balance at Beginning of Period $ 0.9 $ 0.9 $ 0.9
Additions, Charged to Income 1.0 1.3 1.1
Additions, Other Charges 0 0 0
Deductions from Reserves 0.9 [1] 1.3 [1] 1.1 [1]
Balance at End of Period 1.0 0.9 0.9
Finance Receivables - Long-Term [Member]
      
Valuation and Qualifying Accounts and Reserves [Line Items]      
Balance at Beginning of Period 0.6 0.8 0.4
Additions, Charged to Income 0 0.1 0.8
Additions, Other Charges 0 0 0
Deductions from Reserves 0 [1] 0.3 [1] 0.4 [1]
Balance at End of Period 0.6 0.6 0.8
Deferred Tax Assets [Member]
      
Valuation and Qualifying Accounts and Reserves [Line Items]      
Balance at Beginning of Period 0.4 0.5 0.3
Additions, Charged to Income 2.0 (0.1) 0.2
Additions, Other Charges 0 0 0
Deductions from Reserves 0 [1] 0 [1] 0 [1]
Balance at End of Period $ 2.4 $ 0.4 $ 0.5
[1] Includes uncollectible accounts written off.