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Defined contribution and defined benefit retirement plans - Composition of Pension Plan Assets (Detail) - Defined benefit pension plans - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | $ 435.1 | $ 395.6 |
Foreign Pension Plans Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 422.6 | 383.6 | $ 470.1
D E |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 269.4 | 234.0 |
Other. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 15.9 | 17.3 |
U S |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 12.5 | 12.0 | $ 15.9
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 111.2 | 111.1 |
Level 1 | Other. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.4 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 19.5 | 14.8 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 292.1 | 259.0 |
Level 3 | D E |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 269.4 | 234.0 |
Level 3 | Other. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 15.9 | 16.9 |
Assets Measured at NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 12.3 | 10.7 |
Local currency equities | C A |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.1 |
Local currency equities | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 2.4 | 2.3 |
Local currency equities | Level 1 | C A |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.1 |
Local currency equities | Level 1 | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 2.4 | 2.3 |
Non local currency equities | C A |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 2.7 | 11.0 |
Non local currency equities | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 7.2 | 4.7 |
Non local currency equities | Level 1 | C A |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 2.7 | 11.0 |
Non local currency equities | Level 1 | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 7.2 | 4.7 |
Local currency fixed income | C A |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 86.2 | 72.9 |
Local currency fixed income | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 23.9 | 21.8 |
Local currency fixed income | Level 1 | C A |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 86.2 | 72.9 |
Local currency fixed income | Level 1 | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 4.4 | 7.0 |
Local currency fixed income | Level 2 | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 19.5 | 14.8 |
Cash and other | C A |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 1.1 | 0.6 |
Cash and other | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 3.0 | 2.7 |
Cash and other | U S |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.6 | 1.2 |
Cash and other | Level 1 | C A |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 1.1 | 0.6 |
Cash and other | Level 1 | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 2.8 | 2.4 |
Cash and other | Level 1 | U S |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.2 | 0.9 |
Cash and other | Level 3 | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.2 | 0.3 |
Cash and other | Assets Measured at NAV | U S |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.4 | 0.3 |
Non local currency fixed income | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 4.2 | 8.4 |
Non local currency fixed income | Level 1 | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 4.2 | 8.4 |
Real estate | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 6.6 | 7.8 |
Real estate | Level 3 | N O |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 6.6 | 7.8 |
Equity | U S |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 3.5 | 3.8 |
Equity | Level 1 | U S |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.3 |
Equity | Assets Measured at NAV | U S |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 3.5 | 3.5 |
Fixed Income | U S |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 8.4 | 7.0 |
Fixed Income | Level 1 | U S |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.1 |
Fixed Income | Assets Measured at NAV | U S |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | $ 8.4 | $ 6.9 |

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