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Derivatives - Schedule of Gains (Losses) for Derivatives Designated as Fair Value Hedges (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments Gain Loss [Line Items]      
Total (gain) loss recognized as ineffectiveness in the Consolidated Statements of Operations $ (0.4) $ (0.8) $ 1.7
Interest Rate Swap | Investment and other expense-net      
Derivative Instruments Gain Loss [Line Items]      
Total (gain) loss recognized as ineffectiveness in the Consolidated Statements of Operations (1.7) (2.1) 22.5
Hedged Items | Investment and other expense-net      
Derivative Instruments Gain Loss [Line Items]      
Total (gain) loss recognized as ineffectiveness in the Consolidated Statements of Operations $ 1.3 $ 1.3 $ (20.8)