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Postretirement Benefit Plans - Changes in Projected Benefit Obligations of Pension and Other Employee-Related Defined Benefit Plans (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Change in benefit obligation |  |  |
Benefit obligation – January 1 | $ 531.0 | $ 561.3 |
Service cost | 6.8 | 6.3 |
Interest cost | 16.5 | 18.3 |
Amendments | 2.0 | 0.4 |
Actuarial loss (gain) | 20.7 | 8.2 |
Benefits and expenses paid | (33.6) | (32.7) |
Acquired | 3.5 | 0.0 |
Settlement | (0.4) | (28.5) |
Curtailment | 0.0 | (0.2) |
Foreign currency translation | 10.6 | (2.1) |
Benefit obligation – December 31 | 557.1 | 531.0 | $ 561.3
Other Postretirement Benefits Plan [Member] |  |  |
Change in benefit obligation |  |  |
Benefit obligation – January 1 | 138.8 | 143.4 |
Service cost | 0.8 | 0.9 | 0.9
Interest cost | 4.4 | 4.9 | 5.0
Amendments | 0.4 | 0.0 |
Actuarial loss (gain) | 1.9 | (1.9) |
Benefits and expenses paid | (8.2) | (8.5) |
Acquired | 0.0 | 0.0 |
Settlement | 0.0 | 0.0 |
Curtailment | 0.0 | 0.0 |
Foreign currency translation | 0.0 | 0.0 |
Benefit obligation – December 31 | 138.1 | 138.8 | 143.4
Pension Plan [Member] |  |  |
Change in benefit obligation |  |  |
Benefit obligation – January 1 | 392.2 |  |
Service cost | 6.0 | 5.4 | 5.0
Interest cost | 12.1 | 13.4 | 14.5
Settlement |  | (1.4) |
Benefit obligation – December 31 | 419.0 | 392.2 |
U.S. Plan [Member] |  |  |
Change in benefit obligation |  |  |
Settlement |  | (26.6) |
U.S. Plan [Member] | Pension Plan [Member] |  |  |
Change in benefit obligation |  |  |
Benefit obligation – January 1 | 312.3 | 339.9 |
Service cost | 4.6 | 4.1 | 3.5
Interest cost | 10.5 | 11.9 | 13.0
Amendments | 1.6 | 0.0 |
Actuarial loss (gain) | 19.1 | 5.9 |
Benefits and expenses paid | (22.4) | (21.5) |
Acquired | 0.0 | 0.0 |
Settlement | 0.0 | (28.0) |
Curtailment | 0.0 | 0.0 |
Foreign currency translation | 0.0 | 0.0 |
Benefit obligation – December 31 | 325.7 | 312.3 | 339.9
International Plan [Member] | Pension Plan [Member] |  |  |
Change in benefit obligation |  |  |
Benefit obligation – January 1 | 79.9 | 78.0 |
Service cost | 1.4 | 1.3 | 1.5
Interest cost | 1.6 | 1.5 | 1.5
Amendments | 0.0 | 0.4 |
Actuarial loss (gain) | (0.3) | 4.2 |
Benefits and expenses paid | (3.0) | (2.7) |
Acquired | 3.5 | 0.0 |
Settlement | (0.4) | (0.5) |
Curtailment | 0.0 | (0.2) |
Foreign currency translation | 10.6 | (2.1) |
Benefit obligation – December 31 | $ 93.3 | $ 79.9 | $ 78.0

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- Definition Defined Benefit Plan Benefits And Expenses Paid, Including Unfunded Portion + References No definition available. + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase in benefit obligation of defined benefit plan from business combination. + 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 (a)(8) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees. + 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 (a)(10) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan. + 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 (a)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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