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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 196.3  
Other comprehensive income (loss) before reclassifications, net of tax $ 2.3 $ (12.5) 19.2 $ 6.7
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax (1.1) [1] (4.8) [1] (2.5) [2] (9.7) [2]
Total other comprehensive income (loss) 1.2 (17.3) 16.7 (3.0)
Ending balance 200.0   200.0  
Foreign Currency Translation Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (192.5) (163.0) (215.5) (183.0)
Other comprehensive income (loss) before reclassifications, net of tax 6.7 (15.8) 29.7 4.2
Total other comprehensive income (loss) 6.7 (15.8) 29.7 4.2
Ending balance (185.8) (178.8) (185.8) (178.8)
Unrealized Gain (Loss) on Derivatives [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 2.9 11.8 10.4 17.4
Other comprehensive income (loss) before reclassifications, net of tax (4.4) 3.3 (10.5) 2.5
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax (1.1) [1] (4.8) [1] (2.5) [2] (9.6) [2]
Total other comprehensive income (loss) (5.5) (1.5) (13.0) (7.1)
Ending balance (2.6) 10.3 (2.6) 10.3
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 [2]       (0.1)
Total other comprehensive income (loss)       (0.1)
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (189.6) (151.2) (205.1) (165.5)
Ending balance $ (188.4) $ (168.5) $ (188.4) $ (168.5)
[1] See Note 9, Derivative Instruments and Hedging Activities, for information regarding the location in the condensed consolidated statements of income (loss) of gains (losses) reclassified from accumulated other comprehensive income (loss) into income during the three months ended June 30, 2017 and 2016.
[2] See Note 9, Derivative Instruments and Hedging Activities, for information regarding the location in the condensed consolidated statements of income (loss) of gains (losses) reclassified from accumulated other comprehensive income (loss) into income during the six months ended June 30, 2017 and 2016.