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Employee plans - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) Employee shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of unissued common stock available for grant under the plans (in shares) | shares | 3,800,000 | 3,800,000 |  |
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 |  | $ 9,500,000 | $ 9,400,000 | $ 10,400,000
Proceeds from exercise of stock options |  | 0 | 3,700,000 | 3,400,000
Deferred compensation Liability | $ 12,300,000 | $ 12,300,000 | 12,600,000 |
Number of former associates | Employee | 5,800 |  |  |
Lump sum payments made to former associates | $ 215,900,000 |  |  |
Pension Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
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 |  | $ 10,700,000 | 9,900,000 | 10,600,000
International Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cost recognized for contribution plans |  | 19,000,000 | 21,400,000 | 25,200,000
Pension Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expected pretax amortization of net loss in 2017 |  | 174,100,000 |  |
Expected pretax amortization of prior service cost (credit) in 2017 |  | (5,100,000) |  |
Recognized net actuarial loss |  | 156,300,000 |  |
Amortization of prior service credit |  | (5,500,000) |  |
Estimated cash contributions by the company in 2017 |  | 127,700,000 |  |
International Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Recognized net actuarial loss |  | 40,300,000 | 63,600,000 | 40,200,000
Amortization of prior service credit |  | (3,000,000) | (1,900,000) | (2,100,000)
Estimated cash contributions by the company in 2017 |  | 73,300,000 |  |
Plan assets measured using NAV as a practical expedient | 1,434,200,000 | 1,434,200,000 | 1,631,300,000 |
U.S. Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Recognized net actuarial loss |  | 116,000,000 | 132,700,000 | 109,700,000
Amortization of prior service credit |  | (2,500,000) | (2,400,000) | (400,000)
Estimated cash contributions by the company in 2017 |  | 54,400,000 |  |
Plan assets measured using NAV as a practical expedient | 164,800,000 | 164,800,000 | 150,500,000 |
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 |  | (400,000) |  |
Recognized net actuarial loss |  | 500,000 | 1,800,000 | 1,700,000
Amortization of prior service credit |  | 0 | 1,100,000 | 1,700,000
Estimated cash contributions by the company in 2017 |  | 13,000,000 |  |
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | 7,500,000 | 4,700,000 | 3,300,000
Total unrecognized compensation cost | 8,200,000 | $ 8,200,000 |  |
Unrecognized compensation cost, Weighted-average recognition period |  | 2 years |  |
Aggregate weighted-average grant-date fair value of units granted |  | $ 12,900,000 | 10,200,000 | 12,800,000
Aggregate weighted-average grant-date fair value of units vested |  | 3,500,000 | 2,100,000 | 3,300,000
Employee Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | 2,000,000 | 4,700,000 | 7,100,000
Total intrinsic value of options exercised |  | 0 | $ 600,000 | $ 4,700,000
Total unrecognized compensation cost | $ 1,400,000 | $ 1,400,000 |  |
Unrecognized compensation cost, Weighted-average recognition period |  | 1 year 2 months 12 days |  |
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 |  | 2.0 |  |
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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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