Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes - Components of Income Tax Expense (Detail)

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Income Taxes - Components of Income Tax Expense (Detail) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Income before income taxes:      
Domestic $ 172.2 $ 150.1 $ 145.5
Foreign 194.8 180.4 177.1
Income before income taxes 367.0 330.5 322.6
Current      
Domestic (15.2) (12.6) (11.9)
Foreign (36.0) (59.2) (39.3)
Current income tax expense (51.2) (71.8) (51.2)
Deferred      
Domestic (4.0) (5.6) (3.7)
Foreign (35.3) (8.7) 23.6
Deferred income tax (expense) benefit (39.3) (14.3) 19.9
Total income tax expense $ (90.5) $ (86.1) $ (31.3)