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Income Taxes - Component of Income Taxes Expenses (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Currently payable (refundable): |  |  |
U.S. federal and state | $ 27.5 | $ 7.6 | $ 7.4
Non-U.S. | 9.5 | 3.3 | 15.2
Total | 37.0 | 10.9 | 22.6
Deferred income taxes (benefit): |  |  |
U.S. federal and state | (33.7) | (58.5) | 3.8
Non-U.S. | 2.7 | 144.9 | 6.1
Total | (31.0) | 86.4 | 9.9
Provision for income taxes (benefit) | $ 6.0 | $ 97.3 | $ 32.5

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