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COMMITMENTS AND CONTINGENCIES - Part 1 (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Leased Assets [Line Items]      
Operating Leases, Rent Expense $ 5.0us-gaap_LeaseAndRentalExpense $ 4.8us-gaap_LeaseAndRentalExpense $ 4.8us-gaap_LeaseAndRentalExpense
Operating Leases, Future Minimum Payments Due [Abstract]      
2015 4.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 4.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 4.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 4.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 3.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 10.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total $ 31.3us-gaap_OperatingLeasesFutureMinimumPaymentsDue