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Changes in Level 3 Liabilities (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Contingent Consideration    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value at January 1 $ 0.0 $ 55.4
Total (Gains) and Losses:    
Included in Earnings 0.0 (0.1)
Purchases, Issuances, Sales, and Settlements:    
Settlements 0.0 (55.3)
Fair Value at December 31 0.0 0.0
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at December 31 0.0 0.0
Visa Conversion Rate Swap    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value at January 1 0.0 0.0
Total (Gains) and Losses:    
Included in Earnings 12.1 0.0
Purchases, Issuances, Sales, and Settlements:    
Settlements (1.3) 0.0
Fair Value at December 31 10.8 0.0
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at December 31 $ 12.0 $ 0.0