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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 1,147.1 |  |
Other comprehensive income/(losses) before reclassifications | (20.1) | $ 15.9 |
Amounts reclassified from AOCL | 98.5 | (1.3) |
Actuarial net losses arising during the year | (21.3) | (17.5) | $ (69.9)
Net current period other comprehensive income/(losses) | 57.1 | (2.9) |
Ending Balance | 1,211.2 | 1,147.1 |
Accumulated Other Comprehensive Loss [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (148.1) | (145.2) |
Actuarial net losses arising during the year | (21.3) | (17.5) | (69.9)
Ending Balance | (91.0) | (148.1) | (145.2)
Defined Benefit Pension Plan Items [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (77.2) | (58.4) |
Other comprehensive income/(losses) before reclassifications | 0.0 | 0.0 |
Amounts reclassified from AOCL | 98.5 | (1.3) |
Actuarial net losses arising during the year | (21.3) | (17.5) |
Net current period other comprehensive income/(losses) | 77.2 | (18.8) |
Ending Balance | 0.0 | (77.2) | (58.4)
Foreign Currency Translation Items [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (70.9) | (86.8) |
Other comprehensive income/(losses) before reclassifications | (20.1) | 15.9 |
Amounts reclassified from AOCL | 0.0 | 0.0 |
Actuarial net losses arising during the year | 0.0 | 0.0 |
Net current period other comprehensive income/(losses) | (20.1) | 15.9 |
Ending Balance | $ (91.0) | $ (70.9) | $ (86.8)

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