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Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Income before income taxes: |  |  |
Domestic | $ 196.4 | $ 155.1 | $ 172.2
Foreign | 104.2 | 19.2 | 194.8
Income before income taxes | 300.6 | 174.3 | 367.0
Current: |  |  |
Domestic | (26.6) | (14.8) | (15.2)
Foreign | (6.5) | (69.4) | (36.0)
Current income tax expense | (33.1) | (84.2) | (51.2)
Deferred: |  |  |
Domestic | (1.3) | (1.8) | (4.0)
Foreign | (37.4) | 57.8 | (35.3)
Deferred income tax (expense) benefit | (38.7) | 56.0 | (39.3)
Total income tax expense | $ (71.8) | $ (28.2) | $ (90.5)

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