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Employee plans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) plan shares | Dec. 31, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares of unissued common stock available for grant under the plans (in shares) | shares | 5,800,000 |  |
Share-based compensation expense | $ 13,200,000 | $ 13,200,000 | $ 11,200,000
Grants of stock option awards (in shares) | shares | 0 | 0 | 0
Stock option awards outstanding (in shares) | shares | 500,000 |  |
Weighted-average exercise price of outstanding stock option awards (in dollars per share) | $ / shares | $ 23.60 |  |
Matching contribution by the company as percentage of participants' contribution | 50.00% |  |
Percentage of eligible pay contributed by participants that will be matched | 6.00% |  |
Cost recognized for contribution plans | $ 12,800,000 | $ 11,100,000 | $ 10,800,000
Deferred compensation liability | 14,700,000 | 11,600,000 |
International Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cost recognized for contribution plans | 19,300,000 | 21,300,000 | 18,500,000
Pension Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Estimated cash contributions by the company in next fiscal year | 278,900,000 |  |
Pension Plans | U.S. Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash pension settlement charge | 0 | $ 0 | 0
Estimated cash contributions by the company in next fiscal year | 238,800,000 |  |
Pension Plans | International Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of defined benefit plans with cash lump-sum payments paid to certain plan participants | plan |  | 2 |
Non-cash pension settlement charge | 1,200,000 | $ 6,400,000 | 0
Estimated cash contributions by the company in next fiscal year | 40,100,000 |  |
Other Postretirement Benefit Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Estimated cash contributions by the company in next fiscal year | $ 7,000,000 |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Certain investments valued using net asset value as practical expedient, redemption notice period | 120 days |  |
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 13,200,000 | 13,100,000 | 10,100,000
Aggregate weighted-average grant-date fair value of units granted | 16,900,000 | 17,900,000 | 14,400,000
Total unrecognized compensation cost | $ 11,800,000 |  |
Unrecognized compensation cost, weighted-average recognition period | 1 year 9 months 18 days |  |
Aggregate weighted-average grant-date fair value of units vested | $ 14,900,000 | 10,400,000 | 7,400,000
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 0 | $ 100,000 | $ 1,100,000
Performance-Based Unit | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares which will vest after achievement of goals (in shares) | shares | 0 |  |
Performance-Based Unit | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares which will vest after achievement of goals (in shares) | shares | 2 |  |

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Number of Shares Vesting After Achievement of Goals + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award, other than options, grants in period, weighted average grant date fair value. + References No definition available. + Details
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- Definition Share-based compensation arrangement by share-based payment award, other than options, vested in period, weighted average grant date fair value. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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