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Postretirement Benefit Plans - Other Changes in Plan Assets and Net Periodic Postretirement Cost Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Net periodic postretirement cost |  |  |
Service cost | $ 5.9 | $ 6.3 |
Interest cost | 19.5 | 22.9 |
Amortization of prior service cost |  | 0.0 | $ 0.0
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Prior service cost |  |  | 0.0
U.S. Pension Plans [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 3.5 | 3.2 | 4.9
Interest cost | 13.0 | 13.1 | 12.1
Expected return on plan assets | (20.8) | (20.0) | (19.5)
Amortization of net actuarial loss (gain) | 7.5 | 5.8 | 8.3
Amortization of prior service cost | 1.0 | 0.6 | 0.8
Net periodic postretirement cost | 4.2 | 2.7 | 6.6
Effect of curtailment / Special termination benefit | 0.0 | 0.0 | 1.2
Total net periodic postretirement cost | 4.2 | 2.7 | 7.8
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial loss (gain) | 13.9 | 37.0 | (40.0)
Prior service cost | 0.0 | 4.5 | 0.0
Amortization of net actuarial (loss) gain | (7.5) | (5.8) | (8.3)
Amortization of prior service cost | (1.0) | (0.6) | (0.8)
Foreign currency translation | 0.0 | 0.0 | 0.0
Total change recognized in other comprehensive loss | 5.4 | 35.1 | (49.1)
Total impact from net periodic postretirement cost and changes in other comprehensive loss | 9.6 | 37.8 | (41.3)
International Pension Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 1.5 | 1.6 | 1.7
Interest cost | 1.5 | 2.4 | 2.5
Expected return on plan assets | 0.0 | (0.1) | (0.1)
Amortization of net actuarial loss (gain) | 1.0 | 0.4 | 0.6
Amortization of prior service cost | 0.0 |  |
Net periodic postretirement cost | 4.0 | 4.3 | 4.7
Effect of curtailment / Special termination benefit | 0.1 | 0.4 | 0.0
Total net periodic postretirement cost | 4.1 | 4.7 | 4.7
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial loss (gain) | (2.9) | 13.7 | (1.8)
Prior service cost | 0.0 | 0.0 | 0.0
Amortization of net actuarial (loss) gain | (1.1) | (0.9) | (0.6)
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Foreign currency translation | (2.5) | (1.8) | 0.5
Total change recognized in other comprehensive loss | (6.5) | 11.0 | (1.9)
Total impact from net periodic postretirement cost and changes in other comprehensive loss | (2.4) | 15.7 | 2.8
Pension [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 5.0 | 4.8 | 6.6
Interest cost | 14.5 | 15.5 | 14.6
Expected return on plan assets | (20.8) | (20.1) | (19.6)
Amortization of net actuarial loss (gain) | 8.5 | 6.2 | 8.9
Amortization of prior service cost | 1.0 | 0.6 | 0.8
Net periodic postretirement cost | 8.2 | 7.0 | 11.3
Effect of curtailment / Special termination benefit | 0.1 | 0.4 | 1.2
Total net periodic postretirement cost | 8.3 | 7.4 | 12.5
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial loss (gain) | 11.0 | 50.7 | (41.8)
Prior service cost | 0.0 | 4.5 |
Amortization of net actuarial (loss) gain | (8.6) | (6.7) | (8.9)
Amortization of prior service cost | (1.0) | (0.6) | (0.8)
Foreign currency translation | (2.5) | (1.8) | 0.5
Total change recognized in other comprehensive loss | (1.1) | 46.1 | (51.0)
Total impact from net periodic postretirement cost and changes in other comprehensive loss | 7.2 | 53.5 | (38.5)
Other Postretirement Benefit Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 0.9 | 1.5 | 2.9
Interest cost | 5.0 | 7.4 | 8.3
Expected return on plan assets | (0.9) | (0.7) | (0.6)
Amortization of net actuarial loss (gain) | 4.6 | 2.7 | 4.3
Amortization of prior service cost | (11.0) | (6.6) | (0.4)
Net periodic postretirement cost | (1.4) | 4.3 | 14.5
Effect of curtailment / Special termination benefit | (4.2) | 0.0 | 0.0
Total net periodic postretirement cost | (5.6) | 4.3 | 14.5
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial loss (gain) | 7.7 | 26.3 | (31.1)
Prior service cost | 0.0 | (58.7) | (19.0)
Amortization of net actuarial (loss) gain | (4.6) | (2.7) | (4.3)
Amortization of prior service cost | 11.0 | 6.6 | 0.4
Acceleration of prior service costs | 6.2 | 0.0 | 0.0
Total change recognized in other comprehensive loss | 20.3 | (28.5) | (54.0)
Total impact from net periodic postretirement cost and changes in other comprehensive loss | $ 14.7 | $ (24.2) | $ (39.5)

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- Definition Defined Benefit Plan Amounts Recognized In Net Periodic Benefit Cost Excluding Curtailment And Special Termination Benefit Expenses. + References No definition available. + Details
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- Definition The amount of gains or losses recognized in net periodic benefit cost. + 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 (h)(4) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + 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 (h)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 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)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount before tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans. + 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 (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 + Details
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- Definition Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6939497&loc=d3e30304-110892 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,d) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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