Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail)

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Shareholders' Equity - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 196.3  
Other comprehensive income (loss) before reclassifications, net of tax 16.9 $ 19.3
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax [1] (1.4) (5.0)
Total other comprehensive Income (loss) 15.5 14.3
Ending balance 267.4  
Foreign Currency Translation Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (215.5) (183.0)
Other comprehensive income (loss) before reclassifications, net of tax 23.0 20.0
Total other comprehensive Income (loss) 23.0 20.0
Ending balance (192.5) (163.0)
Unrealized Gain (Loss) on Derivatives [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 10.4 17.4
Other comprehensive income (loss) before reclassifications, net of tax (6.1) (0.7)
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax [1] (1.4) (4.9)
Total other comprehensive Income (loss) (7.5) (5.6)
Ending balance 2.9 11.8
Other [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance   0.1
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax [1]   (0.1)
Total other comprehensive Income (loss)   (0.1)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (205.1) (165.5)
Ending balance $ (189.6) $ (151.2)
[1] See Note 9, Derivative Instruments and Hedging Activities, for information regarding the location in the condensed consolidated statements of income of gains (losses) reclassified from accumulated other comprehensive income (loss) into income during the three months ended March 31, 2017 and 2016.