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Income Taxes - Roll-Forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties (Detail) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Contingency [Line Items] |  |  |  |  |  |
Opening balance at January 1 | $ 3.9 | $ 6.2 | $ 13.0 |  |  |
Reductions for tax positions of prior periods | (0.7) | 0.0 | (4.0) |  |  |
Additions for tax positions of prior periods | 0.0 | 0.4 | 0.1 |  |  |
Additions for current year tax positions | 0.0 | 1.2 | 0.2 |  |  |
Reductions due to lapsed statutes of limitations | (0.9) | (3.9) | (3.1) |  |  |
Closing balance at December 31 | 2.3 | 3.9 | 6.2 |  |  |
Current |  |  |  | $ 0.0 | $ 0.0 | $ 0.0
Non-current |  |  |  | 2.3 | 3.9 | 6.2
Unrecognized tax benefits | 3.9 | 6.2 | 13.0 | 2.3 | 3.9 | 6.2
Unrecognized Tax Benefits [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Opening balance at January 1 | 3.6 | 5.7 | 11.9 |  |  |
Reductions for tax positions of prior periods | (0.6) | 0.0 | (3.6) |  |  |
Additions for tax positions of prior periods | 0.0 | 0.3 | 0.1 |  |  |
Additions for current year tax positions | 0.0 | 1.2 | 0.2 |  |  |
Reductions due to lapsed statutes of limitations | (0.8) | (3.6) | (2.9) |  |  |
Closing balance at December 31 | 2.2 | 3.6 | 5.7 |  |  |
Current |  |  |  | 0.0 | 0.0 | 0.0
Non-current |  |  |  | 2.2 | 3.6 | 5.7
Unrecognized tax benefits | 3.6 | 5.7 | 11.9 | 2.2 | 3.6 | 5.7
Interest and Penalties [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Opening balance at January 1 | 0.3 | 0.5 | 1.1 |  |  |
Reductions for tax positions of prior periods | (0.1) | 0.0 | (0.4) |  |  |
Additions for tax positions of prior periods | 0.0 | 0.1 | 0.0 |  |  |
Additions for current year tax positions | 0.0 | 0.0 | 0.0 |  |  |
Reductions due to lapsed statutes of limitations | (0.1) | (0.3) | (0.2) |  |  |
Closing balance at December 31 | 0.1 | 0.3 | 0.5 |  |  |
Current |  |  |  | 0.0 | 0.0 | 0.0
Non-current |  |  |  | 0.1 | 0.3 | 0.5
Unrecognized tax benefits | $ 0.3 | $ 0.5 | $ 1.1 | $ 0.1 | $ 0.3 | $ 0.5

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