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Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Foreign currency translation adjustment: |  |  |  |
Balance at beginning of period | $ (789.1) | $ (849.1) |  |
Other comprehensive (loss) income before reclassifications | (51.1) | 22.6 |  |
Amount reclassified from accumulated other comprehensive loss, net of tax | 0.0 | 0.0 |  |
Balance at end of period | (840.2) | (826.5) |  |
Derivative Instrument: |  |  |  |
Balance at beginning of period | 33.5 | 35.0 |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax | 0.0 | (2.1) |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 0.7 | 0.3 |  |
Balance at end of period | 32.8 | 32.6 |  |
Defined Benefit Pension and Other Postretirement Plans |  |  |  |
Balance at beginning of period | (188.3) | (176.0) | $ (190.6) | $ (179.6)
Other comprehensive (loss) income before reclassifications | 0.9 | 2.3 |  |
Amount reclassified from accumulated other comprehensive loss, net of tax | 1.4 | 1.3 |  |
Total: |  |  |  |
Balance at beginning of period | (946.2) | (993.7) |  |
Other comprehensive (loss) income before reclassifications | (50.2) | 22.8 |  |
Amount reclassified from accumulated other comprehensive loss, net of tax | 0.7 | 1.0 |  |
Balance at end of period | $ (995.7) | $ (969.9) |  |

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