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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Income tax expense (recovery) |  |  | $ 29.6 | $ 29.5 | $ (17.0)
Tax benefit from change in estimate related to prior year estimate |  |  |  | 6.4 |
Reversal of previously-recorded tax liabilities and uncertainties |  |  |  | 4.5 |
Deferred tax expense related to taxable temporary differences, repatriation of undistributed foreign earnings |  |  | 16.5 | 6.0 |
Tax benefit arising from previously unrecognised tax loss, tax credit or temporary difference of prior period used to reduce deferred tax expense |  |  |  | 5.7 |
Deferred tax liabilities as a result of acquisitions |  |  |  | (0.9) | 56.6
Reversal of previously accrued Mexican taxes |  | $ 6.0 |  |  |
Deductible temporary differences and unused tax losses for which no deferred tax assets have been recognized |  |  | 1,721.9 | 1,783.2 |
Temporary differences associated with investments in subsidiaries for which no deferred tax liabilities have been recognized |  |  | 1.1 | 5.0 |
Deferred tax assets recognized with respect to losses |  |  | $ 9.9 | $ (1.4) |
Initial percentage of tax exemption (percent) |  |  | 100.00% | 100.00% |
Initial term of tax exemption |  |  | 8 years | 8 years |
Percentage of tax exemption (percent) |  |  | 50.00% |  |
Term of tax exemption |  |  | 5 years |  |
Tax Expense (Income) Relating To Current And Future Withholding Taxes On Undistributed Foreign Earnings |  |  | $ 18.3 |  |
Income Tax Expense (Benefit), RTP Adjustments Related To Prior Years |  |  | 4.1 |  |
Income Tax Expense (Benefit), Recognition Of Deferred Tax Assets Of Subsidiary |  |  | 2.6 |  |
Income Tax Expense (Income), Impact Of Foreign Exchange Translation |  |  | 5.1 |  |
Income Tax Expense (Benefit), Reversal Of Tax Uncertainties Of Subsidiary | $ 5.7 |  |  |  |
Net Deferred Tax Assets Relating To Subsidiary |  |  | $ 8.3 |  |
Atrenne |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Tax benefit related to previously unrecognized tax assets |  |  |  |  | 3.7
Impakt |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Tax benefit related to previously unrecognized tax assets |  |  |  |  | 49.6
U.S. group of subsidiaries |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred tax assets recognized with respect to losses |  |  |  |  | $ 5.0
Asian Subsidiary |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |
Deferred tax assets recognized with respect to losses |  |  |  | $ 6.8 |

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