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Employee Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of unissued common stock available for grant under the plans | 2,300,000 |  |
Age requirement for vesting provision, minimum | 55 years |  |
Completion of service period (in years) for stock awards | 5 years |  |
Maximum contractual term of options granted (in years) | 7 years | 5 years |
Option vesting period (in years) | 3 years |  |
Share-based compensation expense | $ 9.4 | $ 10.4 | $ 12.5
Proceeds from exercise of stock options | 3.7 | 3.4 | 4.9
Deferred compensation Liability | 12.6 | 12.1 |
Recognized net actuarial loss | (196.3) |  |
Amortization of prior service (credit) | (4.3) |  |
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | 4.7 | 7.1 | 9.3
Total intrinsic value of options exercised | 0.6 | 4.7 | 7.9
Total unrecognized compensation cost | $ 4.0 |  |
Unrecognized compensation cost, Weighted-average recognition period | 1 year 10 months 24 days |  |
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 4.7 | 3.3 | 3.2
Total unrecognized compensation cost | $ 4.9 |  |
Unrecognized compensation cost, Weighted-average recognition period | 2 years 1 month 6 days |  |
Aggregate weighted-average grant-date fair value of units granted | $ 10.2 | 12.8 | 5.3
Aggregate weighted-average grant-date fair value of units vested | $ 2.1 | 3.3 | 4.5
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 | 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 | 2.0 |  |
Other Postretirement Benefit Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expected pretax amortization of net loss in 2016 | $ (1.1) |  |
Expected pretax amortization of prior service cost in 2016 | 0.1 |  |
Recognized net actuarial loss | (1.8) | (1.7) | (4.5)
Amortization of prior service (credit) | 1.1 | 1.7 | 1.8
Estimated cash contributions by the company in 2016 | $ 15.0 |  |
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 | $ 9.9 | 10.6 | 11.8
Expected pretax amortization of net loss in 2016 | (155.7) |  |
Expected pretax amortization of prior service cost in 2016 | (5.7) |  |
Estimated cash contributions by the company in 2016 | 139.3 |  |
International Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cost recognized for contribution plans | 21.4 | 25.2 | 26.7
Recognized net actuarial loss | (63.6) | (40.2) | (51.9)
Amortization of prior service (credit) | (1.9) | (2.1) | (2.1)
Estimated cash contributions by the company in 2016 | 86.8 |  |
U.S. Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Recognized net actuarial loss | (132.7) | (109.7) | (139.0)
Amortization of prior service (credit) | (2.4) | $ (0.4) | $ 0.7
Estimated cash contributions by the company in 2016 | $ 52.5 |  |

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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + 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=56944662&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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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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