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PROPERTY AND EQUIPMENT, NET (Tables)
12 Months Ended
Dec. 31, 2013
Property and Equipment, Net
  December 31,
  2013 2012
Office and computer equipment (2 - 20 year estimated useful life)$ 129.7 $ 119.7
Office furniture and fixtures (5 - 10 year estimated useful life)  40.6   40.3
Internal-use computer software (3 - 5 year estimated useful life)  284.9   263.9
Leasehold improvements (3 - 20 year estimated useful life)  199.2   197.5
 Total property and equipment, at cost  654.4   621.4
Less: accumulated depreciation and amortization  (375.7)   (314.3)
Total property and equipment, net$ 278.7 $ 307.1