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Unrecognized Tax Benefits (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits at beginning of year $ 29.6 $ 27.2 $ 25.2
Increases as a result of tax positions taken during a prior period 24.0 2.0 4.5
Decreases as a result of tax positions taken during a prior period     (0.2)
Increases as a result of tax positions taken during the current period 4.7 6.8 5.8
Decreases as a result of tax positions taken during the current period (3.1)   (1.7)
Decreases relating to settlements with taxing authorities (3.2) (7.1) (1.3)
Decreases resulting from the lapse of the applicable statute of limitations (1.5) (0.3) (3.5)
Translation Difference (0.9) 1.0 (1.6)
Total unrecognized tax benefits at end of year $ 49.6 $ 29.6 $ 27.2