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Stockholders' equity - Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |
Balance at beginning of period |  |  | $ 950.5 |
Balance at end of period | $ 962.6 |  | 962.6 |
Marketable Securities |  |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |
Balance at beginning of period | 1.7 | $ 1.6 | 1.7 | $ 1.6
Other comprehensive income (loss) |  | (0.1) |  | (0.1)
Balance at end of period | 1.7 | 1.5 | 1.7 | 1.5
Currency Translation |  |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |
Balance at beginning of period | (102.4) | (96.0) | (88.8) | (91.5)
Other comprehensive income (loss) | 1.2 | (3.6) | (12.4) | (8.1)
Balance at end of period | (101.2) | (99.6) | (101.2) | (99.6)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans |  |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |
Balance at beginning of period | (58.3) | (54.4) | (58.8) | (55.0)
Other comprehensive income (loss) | 0.5 | 0.6 | 1.0 | 1.2
Plan settlement |  | 4.0 |  | 4.0
Balance at end of period | (57.8) | (49.8) | (57.8) | (49.8)
Accumulated Defined Benefit Plans Adjustment | OPEB |  |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |
Balance at beginning of period | 0.4 | 0.8 | 0.4 | 1.0
Other comprehensive income (loss) | (0.1) | (0.1) | (0.1) | (0.3)
Balance at end of period | 0.3 | 0.7 | 0.3 | 0.7
Total Accumulated Other Comprehensive Loss |  |  |  |
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  |  |  |
Balance at beginning of period | (158.6) | (148.0) | (145.5) | (143.9)
Other comprehensive income (loss) | 1.6 | 0.8 | (11.5) | (3.3)
Balance at end of period | $ (157.0) | $ (147.2) | $ (157.0) | $ (147.2)

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