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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 1,038.0 |  |
Other comprehensive income/(losses) before reclassifications | 15.9 | $ (29.2) |
Amounts reclassified from AOCL | (1.3) | 0.8 |
Actuarial net gains/(losses) arising during the year | (17.5) | (69.9) | $ (28.2)
Net current period other comprehensive income/(losses) | (2.9) | (98.3) |
Ending Balance | 1,147.1 | 1,038.0 |
Accumulated Other Comprehensive Loss [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (145.2) | (46.9) |
Actuarial net gains/(losses) arising during the year | (17.5) | (69.9) | (28.2)
Ending Balance | (148.1) | (145.2) | (46.9)
Defined Benefit Pension Plan Items [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (58.4) | 10.7 |
Other comprehensive income/(losses) before reclassifications | 0.0 | 0.0 |
Amounts reclassified from AOCL | (1.3) | 0.8 |
Actuarial net gains/(losses) arising during the year | (17.5) | (69.9) |
Net current period other comprehensive income/(losses) | (18.8) | (69.1) |
Ending Balance | (77.2) | (58.4) | 10.7
Foreign Currency Translation Items [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (86.8) | (57.6) |
Other comprehensive income/(losses) before reclassifications | 15.9 | (29.2) |
Amounts reclassified from AOCL | 0.0 | 0.0 |
Actuarial net gains/(losses) arising during the year | 0.0 | 0.0 |
Net current period other comprehensive income/(losses) | 15.9 | (29.2) |
Ending Balance | $ (70.9) | $ (86.8) | $ (57.6)

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