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Pension and other postretirement benefits - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Accumulated benefit obligations for plans with accumulated benefit obligations and projected benefit obligations in excess of plan assets | $ 481.0 | $ 451.8 |
Projected benefit obligations for plans with accumulated benefit obligations and projected benefit obligations in excess of plan assets | 481.8 | 452.4 |
Fair value of plan assets for plans with accumulated benefit obligations and projected benefit obligations in excess of plan assets | 434.3 | 403.0 |
Defined benefit plans, annual average Medicare part D subsidy | 0.1 |  |
Defined contribution plans, costs | $ 21.7 | $ 17.5 | $ 15.6
Defined Benefit Plan, Equity Securities |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target allocation percentage of securities | 41.00% |  |
Fixed Income Securities |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target allocation percentage of securities | 54.00% |  |
Other Securities |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target allocation percentage of securities | 5.00% |  |
Pension |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Discount rate | 2.50% | 3.20% |
Rate of return | 7.50% | 7.70% | 7.80%
Accumulated benefit obligation | $ 500.6 | $ 469.6 |
Expected employer contribution next fiscal year | $ 12.7 |  |
Postretirement Health Care Plans |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Discount rate | 2.30% | 3.10% |
Expected employer contribution next fiscal year | $ 3.1 |  |
U.S. | Pension |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Discount rate | 2.64% |  |
Rate of return | 7.00% | 7.75% |
U.S. | Postretirement Health Care Plans |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Discount rate | 2.29% |  |
Foreign Plan | Pension |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Plan assets with accumulated benefit obligation in excess of plan assets | $ 3.7 | $ 2.4 |

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- Definition Defined benefit plans, annual average Medicare part D subsidy. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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