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Employee plans - Additional Information (Detail) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) plan $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) $ / shares 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 | 2,400,000 |  |
Share-based compensation expense | $ 13.2 | $ 11.2 | $ 9.5
Grants of stock option awards (in shares) | shares | 0 | 0 | 11,000
Weighted-average fair value of grant (in dollars per share) | $ / shares |  |  | $ 4.53
Stock option awards outstanding (in shares) | shares | 1,100,000 |  |
Weighted-average exercise price of outstanding stock option awards (in dollars per share) | $ / shares | $ 27.90 |  |
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 | $ 11.1 | $ 10.8 | $ 10.7
Deferred compensation liability | 11.6 | 13.4 |
International Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cost recognized for contribution plans | 21.3 | 18.5 | 19.0
Pension Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Estimated cash contributions by the company in next fiscal year | 105.6 |  |
Pension Plans | U.S. Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash pension settlement charge | 0.0 | 0.0 | 0.0
Estimated cash contributions by the company in next fiscal year | $ 67.2 |  |
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 | $ 6.4 | 0.0 | 0.0
Estimated cash contributions by the company in next fiscal year | 38.4 |  |
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 | 8.0 |  |
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | 13.1 | 10.1 | 7.5
Aggregate weighted-average grant-date fair value of units granted | 17.9 | 14.4 | 12.9
Total unrecognized compensation cost | $ 12.2 |  |
Unrecognized compensation cost, weighted-average recognition period | 1 year 10 months 25 days |  |
Aggregate weighted-average grant-date fair value of units vested | $ 10.4 | 7.4 | 3.5
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 0.1 | $ 1.1 | $ 2.0
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 Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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