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Income Taxes - Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule Of Income Tax [Line Items] |  |  |  |  |
U.S. |  |  | $ 11.5 | $ 5.5 | $ 59.2
Non-U.S. |  |  | 49.7 | (36.3) | 74.5
Income (loss) before income taxes |  |  | 61.2 | (30.8) | 133.7
Expected tax expense (benefit), at U.S. federal statutory income tax rate of 35% |  |  | 21.4 | (10.8) | 46.8
Non-U.S. tax rates |  |  | (4.3) | 0.5 | (4.2)
Incremental net tax (benefit) on earnings and losses of non-U.S. companies |  |  | 2.2 | (8.7) | (3.7)
Valuation allowance |  |  | (2.2) | 159.0 |
Adjustment to the reserve for uncertain tax positions, net | $ 2.4 |  | 2.4 | 0.7 | (5.1)
Nondeductible expenses |  |  | 1.5 | 2.1 | 1.9
U.S. state income taxes and other, net |  |  | 0.3 |  | (1.2)
Provision for income taxes |  |  | 17.9 | 142.8 | 34.5
Currently payable: |  |  |  |  |
U.S. federal and state |  |  |  | 0.3 | 1.9
Non-U.S. |  |  | 9.5 | 3.3 | 15.2
Total |  |  | 9.5 | 3.6 | 17.1
Deferred income taxes (benefit): |  |  |  |  |
U.S. federal and state |  |  | 4.3 | (6.4) | 10.0
Non-U.S. |  |  | 4.1 | 145.6 | 7.4
Total |  |  | 8.4 | 139.2 | 17.4
Comprehensive provision for income taxes (benefit) allocable to: |  |  |  |  |
Net income |  |  | 17.9 | 142.8 | 34.5
Other comprehensive income (loss): |  |  |  |  |
Currency translation |  |  |  |  | (16.9)
Marketable securities |  |  | 1.3 | 1.1 | (6.7)
Interest rate swap |  |  | 0.2 | (1.3) |
Total |  |  | 18.4 | 144.0 | (19.6)
Defined Benefit Pension Plans |  |  |  |  |
Other comprehensive income (loss): |  |  |  |  |
Benefit plans |  |  | (0.8) | 1.5 | (30.1)
OPEB |  |  |  |  |
Other comprehensive income (loss): |  |  |  |  |
Benefit plans |  |  | (0.2) | $ (0.1) | $ (0.4)
US-Canada APA |  |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |  |
U.S. - Canada APA | $ 2.2 | $ (5.6) | $ (3.4) |  |

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