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Income Taxes - Changes in Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets, beginning balance | $ 68.9 | $ 47.7
Credited (charged) to net earnings | (4.0) | 23.2
Credited directly to equity | 0.6 | (0.3)
Effects of foreign exchange | 0.5 | (2.6)
Other | (3.5) | 0.9
Deferred tax assets, ending balance | 62.5 | 68.9
Reconciliation of changes in deferred tax liability [Roll Forward] |  |
Deferred tax liabilities, beginning balance | 51.7 | 60.2
Charged (credited) to net earnings | (5.9) | (7.4)
Effects of foreign exchange | (0.2) | (2.4)
Other | (3.4) | 1.3
Deferred tax liabilities, ending balance | 42.2 | 51.7
Unrealized foreign exchange gains |  |
Reconciliation of changes in deferred tax liability [Roll Forward] |  |
Deferred tax liabilities, beginning balance | 20.5 | 27.2
Charged (credited) to net earnings | 2.1 | (5.0)
Effects of foreign exchange | 0.5 | (1.7)
Deferred tax liabilities, ending balance | 23.1 | 20.5
Accounting provisions not currently deductible |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets, beginning balance | 30.9 | 17.7
Credited (charged) to net earnings | (1.4) | 13.7
Effects of foreign exchange | (0.6) | (0.5)
Other | (0.1) |
Deferred tax assets, ending balance | 28.8 | 30.9
Pensions and non-pension post-retirement benefits |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets, beginning balance | 10.0 | 2.8
Credited (charged) to net earnings | (2.4) | 2.8
Credited directly to equity | (0.1) | 4.4
Effects of foreign exchange | (0.1) |
Deferred tax assets, ending balance | 7.4 | 10.0
Tax losses carried forward |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets, beginning balance | 57.0 | 69.2
Credited (charged) to net earnings | (8.3) | (10.7)
Credited directly to equity | 0.0 | 0.4
Effects of foreign exchange | 0.2 | (1.9)
Deferred tax assets, ending balance | 48.9 | 57.0
Property, plant and equipment and intangibles |  |
Reconciliation of changes in deferred tax liability [Roll Forward] |  |
Deferred tax liabilities, beginning balance | 73.5 | 76.2
Charged (credited) to net earnings | (8.0) | (2.4)
Effects of foreign exchange | (0.7) | (0.7)
Other | 0.0 | 0.4
Deferred tax liabilities, ending balance | 64.8 | 73.5
Other |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets, beginning balance | 13.3 | 1.2
Credited (charged) to net earnings | 8.1 | 17.4
Credited directly to equity | 0.7 | (5.1)
Effects of foreign exchange | 1.0 | (0.2)
Other | 0.0 | 0.0
Deferred tax assets, ending balance | 23.1 | 13.3
Reconciliation of changes in deferred tax liability [Roll Forward] |  |
Deferred tax liabilities, beginning balance | 0.0 | 0.0
Other |  | 0.0
Deferred tax liabilities, ending balance | 0.0 | 0.0
Reclassification between deferred tax assets and deferred tax liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Deferred tax assets, beginning balance | (42.3) | (43.2)
Other | (3.4) | 0.9
Deferred tax assets, ending balance | (45.7) | (42.3)
Reconciliation of changes in deferred tax liability [Roll Forward] |  |
Deferred tax liabilities, beginning balance | (42.3) | (43.2)
Other | (3.4) | 0.9
Deferred tax liabilities, ending balance | $ (45.7) | $ (42.3)

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