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Employee plans - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) Employee | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
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 |  | 3,200,000 |  |
Age requirement for vesting provision, minimum |  | 55 years |  |
Completion of service period (in years) for stock awards |  | 5 years |  |
Option vesting period (in years) |  | 3 years |  |
Share-based compensation expense |  | $ 11,200,000 | $ 9,500,000 | $ 9,400,000
Grants of stock option awards (in shares) | shares |  | 0 |  |
Proceeds from exercise of stock options |  | $ 0 | 0 | 3,700,000
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 |  | $ 10,800,000 | 10,700,000 | 9,900,000
Deferred compensation liability | $ 12,300,000 | 13,400,000 | 12,300,000 |
Number of former associates | Employee | 5,800 |  |  |
Lump sum payments made to former associates | $ 215,900,000 |  |  |
International Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cost recognized for contribution plans |  | 18,500,000 | 19,000,000 | 21,400,000
Pension Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expected pretax amortization of net loss in 2017 |  | 167,600,000 |  |
Expected pretax amortization of prior service cost (credit) in 2017 |  | 6,300,000 |  |
Amortization of net loss |  | 176,200,000 |  |
Amortization of prior service credit |  | (4,900,000) |  |
Estimated cash contributions by the company in 2017 |  | 149,700,000 |  |
Pension Plans | U.S. Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Curtailment gain |  | 0 | 0 | 0
Amortization of net loss |  | 126,400,000 | 116,000,000 | 132,700,000
Amortization of prior service credit |  | (2,500,000) | (2,500,000) | (2,400,000)
Estimated cash contributions by the company in 2017 |  | 86,300,000 |  |
Pension Plans | International Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Curtailment gain |  | 5,400,000 | 2,000,000 | 0
Amortization of net loss |  | 49,800,000 | 40,300,000 | 63,600,000
Amortization of prior service credit |  | (2,400,000) | (3,000,000) | (1,900,000)
Estimated cash contributions by the company in 2017 |  | 63,400,000 |  |
Other Postretirement Benefit Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expected pretax amortization of net loss in 2017 |  | 1,200,000 |  |
Expected pretax amortization of prior service cost (credit) in 2017 |  | (1,600,000) |  |
Amortization of net loss |  | 800,000 | 500,000 | 1,800,000
Amortization of prior service credit |  | (700,000) | 0 | 1,100,000
Estimated cash contributions by the company in 2017 |  | 12,000,000 |  |
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | 10,100,000 | 7,500,000 | 4,700,000
Total unrecognized compensation cost |  | $ 9,800,000 |  |
Unrecognized compensation cost, Weighted-average recognition period |  | 1 year 10 months 25 days |  |
Aggregate weighted-average grant-date fair value of units granted |  | $ 14,400,000 | 12,900,000 | 10,200,000
Aggregate weighted-average grant-date fair value of units vested |  | 7,400,000 | 3,500,000 | 2,100,000
Employee Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | 1,100,000 | $ 2,000,000 | 4,700,000
Total intrinsic value of options exercised |  | 0 |  | $ 600,000
Total unrecognized compensation cost |  | $ 100,000 |  |
Unrecognized compensation cost, Weighted-average recognition period |  | 6 months |  |
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 |  |
Options Issued in 2015 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum contractual term of options granted (in years) |  | 7 years |  |
Options Issued Before 2015 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum contractual term of options granted (in years) |  | 5 years |  |

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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://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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