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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, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 1,211.2 |  |
Other comprehensive income/(losses) before reclassifications | 55.4 | $ (20.1) |
Amounts reclassified from AOCL | 0.0 | 98.5 |
Actuarial net losses arising during the year | 0.9 | (21.3) | $ (17.5)
Net current period other comprehensive income/(losses) | 56.3 | 57.1 |
Ending Balance | 1,326.1 | 1,211.2 |
Accumulated Other Comprehensive Loss [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (91.0) | (148.1) |
Actuarial net losses arising during the year | 0.9 | (21.3) | (17.5)
Ending Balance | (34.7) | (91.0) | (148.1)
Defined Benefit Pension Plan Items [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 0.0 | (77.2) |
Other comprehensive income/(losses) before reclassifications | 0.0 | 0.0 |
Amounts reclassified from AOCL | 0.0 | 98.5 |
Actuarial net losses arising during the year | 0.9 | (21.3) |
Net current period other comprehensive income/(losses) | 0.9 | 77.2 |
Ending Balance | 0.9 | 0.0 | (77.2)
Foreign Currency Translation Items [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (91.0) | (70.9) |
Other comprehensive income/(losses) before reclassifications | 55.4 | (20.1) |
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) | 55.4 | (20.1) |
Ending Balance | $ (35.6) | $ (91.0) | $ (70.9)

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