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Supplemental Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Supplemental disclosure of cash flow information:      
Interest paid $ 25.6us-gaap_InterestPaid $ 28.1us-gaap_InterestPaid $ 19.4us-gaap_InterestPaid
Income taxes paid 3.5us-gaap_IncomeTaxesPaid 2.1us-gaap_IncomeTaxesPaid 1.8us-gaap_IncomeTaxesPaid
Non-cash investing and financing activities:      
Stock repurchases not yet settled (accrued in accounts payable) 0.8us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1 1.0us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1 0us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1
Unpaid purchases of property and equipment 1.8us-gaap_CapitalExpendituresIncurredButNotYetPaid 4.4us-gaap_CapitalExpendituresIncurredButNotYetPaid 3.4us-gaap_CapitalExpendituresIncurredButNotYetPaid
Purchases of property and equipment through capital leasing arrangements $ 0us-gaap_CapitalLeaseObligationsIncurred $ 0.2us-gaap_CapitalLeaseObligationsIncurred $ 0.1us-gaap_CapitalLeaseObligationsIncurred