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COMMITMENTS AND CONTINGENCIES (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Lease Obligations      
Total operating lease expense, net of sublease income $ 20.1us-gaap_OperatingLeasesRentExpenseNet $ 12.8us-gaap_OperatingLeasesRentExpenseNet $ 10.9us-gaap_OperatingLeasesRentExpenseNet
Escrow and Trust Balances      
Amounts held in escrow and trust accounts $ 62.5asps_EscrowDepositAndTrustAccount $ 71.8asps_EscrowDepositAndTrustAccount  
Minimum      
Operating Lease Obligations      
Customary lease term 1 year    
Maximum      
Operating Lease Obligations      
Customary lease term 10 years