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Pension and other postretirement benefits - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Increase trend rate by 1%, increase the benefit obligation | $ 2.4 |  |
Increase trend rate by 1%, increase the benefit expenses | 0.1 |  |
Decrease trend rate by 1%, decrease the benefit obligation | 2.2 |  |
Decrease trend rate by 1%, decrease the benefit expenses | 0.1 |  |
Defined benefit plans, annual average Medicare part D subsidy | 0.2 |  |
Defined contribution plans, costs | $ 15.6 | $ 12.5 | $ 12.0
Equity Securities |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target allocation percentage of securities | 40.00% |  |
Fixed Income Securities |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target allocation percentage of securities | 50.00% |  |
Other Securities |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Target allocation percentage of securities | 10.00% |  |
Pension |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Discount rate | 4.30% | 3.60% |
Rate of return | 7.80% | 8.10% | 8.10%
Accumulated benefit obligation | $ 415.9 | $ 461.6 |
Expected employer contribution for year 2016 | 12.7 |  |
Accumulated other comprehensive income expected to be recognized over the next fiscal year for the Company's pension and postretirement benefit plans | $ 6.8 |  |
Postretirement Health Care Plans |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Discount rate | 4.20% | 3.60% |
Expected employer contribution for year 2016 | $ 4.0 |  |
Accumulated other comprehensive income expected to be recognized over the next fiscal year for the Company's pension and postretirement benefit plans | $ 0.1 |  |
Minimum |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Effective average duration to maintain | 3 years |  |
Maximum |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Effective average duration to maintain | 10 years |  |
United States | Pension |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Discount rate | 4.43% |  |
Rate of return | 8.00% | 8.25% |
United States | Postretirement Health Care Plans |  |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Discount rate | 4.22% |  |
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 | $ 2.8 | $ 1.6 |

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- Definition Fair Value of Plan Assets, Effective Average Duration + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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