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Income Taxes - Component of Income Taxes Expenses (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Currently payable (refundable): |  |  |
U.S. federal and state | $ 87.3 | $ 35.5 | $ 15.1
Non-U.S. | 38.5 | 9.5 | 3.3
Total | 125.8 | 45.0 | 18.4
Deferred income taxes (benefit): |  |  |
U.S. federal and state | (96.9) | (29.1) | (55.8)
Non-U.S. | (148.9) | 2.7 | 144.9
Total | (245.8) | (26.4) | 89.1
Provision for income taxes (benefit) | $ (120.0) | $ 18.6 | $ 107.5

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