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PROPERTY AND EQUIPMENT, NET
12 Months Ended
Dec. 31, 2015
PROPERTY AND EQUIPMENT, NET

NOTE 6 PROPERTY AND EQUIPMENT, NET

Property and equipment, net consisted of:

December 31,
20152014
Office and computer equipment (3 - 10 year estimated useful life)$172.1$152.5
Office furniture and fixtures (3 - 10 year estimated useful life)45.443.8
Internal-use computer software (1 - 10 year estimated useful life)387.0336.8
Leasehold improvements and building (3 - 20 year estimated useful life)220.8220.7
Total property and equipment, at cost825.3753.8
Less: accumulated depreciation and amortization(518.9)(451.5)
Total property and equipment, net$306.4$302.3

Depreciation and amortization expense related to the above assets was $ 81.6 million, $67.2 million, and $65.4 million for the years ended December 31, 2015, 2014 and 2013, respectively.