Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Shareholders' (Deficit) Equity - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 196.3 $ (53.5) $ (334.4)
Other comprehensive income (loss) before reclassifications, net of tax 37.0 (24.1) (72.9)
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax [1] 2.7 (15.5) (14.4)
Total other comprehensive income (loss) 39.7 (39.6) (87.3)
Ending Balance (334.7) 196.3 (53.5)
Foreign Currency Translation Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (215.5) (183.0) (96.4)
Other comprehensive income (loss) before reclassifications, net of tax 44.9 (32.5) (86.6)
Total other comprehensive income (loss) 44.9 (32.5) (86.6)
Ending Balance (170.6) (215.5) (183.0)
Unrealized Gain (Loss) on Derivatives [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 10.4 17.4 18.0
Other comprehensive income (loss) before reclassifications, net of tax (7.9) 8.4 15.4
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax [1] 2.7 (15.4) (16.0)
Total other comprehensive income (loss) (5.2) (7.0) (0.6)
Ending Balance 5.2 10.4 17.4
Unrealized Gain (Loss) on Available-For-Sale Investments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   0.1 0.2
Other comprehensive income (loss) before reclassifications, net of tax     (1.7)
Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax [1]   (0.1) 1.6
Total other comprehensive income (loss)   (0.1) (0.1)
Ending Balance     0.1
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (205.1) (165.5) (78.2)
Ending Balance $ (165.4) $ (205.1) $ (165.5)
[1] See Note 2, Basis of Presentation, and Note 11, Derivative Instruments and Hedging Activities, for information regarding the location in the consolidated statements of income of gains (losses) reclassified from accumulated other comprehensive income (loss) into income during the years ended December 31, 2017, 2016, and 2015.