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Schedule II (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Valuation and Qualifying Accounts Disclosure [Line Items]        
Valuation Allowances and Reserves, Balance $ 1.9 $ 2.6 $ 3.8 $ 1.9
Valuation Allowances and Reserves, Charged to Cost and Expense 2.5 3.3 5.8  
Valuation Allowances and Reserves, Deductions $ 3.2 [1] $ 4.5 [1] $ 3.9 [1]  
[1] Uncollectible accounts receivable written off, net of recoveries.