Quarterly report pursuant to Section 13 or 15(d)

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

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Shareholders' Deficit - Summary of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ (334.7)  
Other comprehensive (loss) income before reclassifications, net of tax $ (10.6) $ 11.1 (39.7) $ 30.2
Amounts reclassified from accumulated other comprehensive loss to income, net of tax 0.3 [1] 2.7 [1] 1.2 [2] 0.3 [2]
Total other comprehensive (loss) income (10.3) 13.8 (38.5) 30.5
Ending balance (761.1)   (761.1)  
Foreign Currency Translation Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (200.2) (185.8) (170.6) (215.5)
Other comprehensive (loss) income before reclassifications, net of tax (4.6) 11.3 (34.2) 41.0
Total other comprehensive (loss) income (4.6) 11.3 (34.2) 41.0
Ending balance (204.8) (174.5) (204.8) (174.5)
Unrealized Gain (Loss) on Derivatives [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 6.6 (2.6) 5.2 10.4
Other comprehensive (loss) income before reclassifications, net of tax (6.0) (0.2) (5.5) (10.8)
Amounts reclassified from accumulated other comprehensive loss to income, net of tax 0.3 [1] 2.7 [1] 1.2 [2] 0.3 [2]
Total other comprehensive (loss) income (5.7) 2.5 (4.3) (10.5)
Ending balance 0.9 (0.1) 0.9 (0.1)
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (193.6) (188.4) (165.4) (205.1)
Ending balance $ (203.9) $ (174.6) $ (203.9) $ (174.6)
[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 loss into income during the three months ended September 30, 2018 and 2017.
[2] 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 loss into income during the nine months ended September 30, 2018 and 2017.