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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
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in benefit obligation |  |  |  |
Benefit obligation – January 1 |  | $ 525.4 | $ 499.8 |
Service cost |  | 2.3 | 2.1 |
Interest cost |  | 10.7 | 16.6 |
Amendments |  | 0.0 | 1.7 |
Actuarial loss(a) | [1] | 52.3 | 45.0 |
Benefits paid |  | (28.4) | (38.7) |
Acquired |  | 0.0 | 0.5 |
Settlement |  | (328.5) | 0.0 |
Foreign currency translation |  | 9.0 | (1.6) |
Benefit obligation – December 31 |  | 242.8 | 525.4 | $ 499.8
Pension Plan [Member] |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation – January 1 |  | 408.8 |  |
Service cost |  | 1.5 | 1.4 | 1.7
Interest cost |  | 7.9 | 12.6 | 11.5
Benefit obligation – December 31 |  | 124.5 | 408.8 |
Other Postretirement Benefits Plan [Member] |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation – January 1 |  | 116.6 | 118.6 |
Service cost |  | 0.8 | 0.7 | 0.9
Interest cost |  | 2.8 | 4.0 | 4.5
Amendments |  | 0.0 | 1.7 |
Actuarial loss(a) |  | 4.0 | 3.6 |
Benefits paid |  | (5.9) | (12.0) |
Acquired |  | 0.0 | 0.0 |
Settlement |  | 0.0 | 0.0 |
Foreign currency translation |  | 0.0 | 0.0 |
Benefit obligation – December 31 |  | 118.3 | 116.6 | 118.6
United States | Pension Plan [Member] |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation – January 1 |  | 310.4 | 291.8 |
Service cost |  | 0.0 | 0.2 | 0.4
Interest cost |  | 6.9 | 11.1 | 10.1
Amendments |  | 0.0 | 0.0 |
Actuarial loss(a) | [1] | 45.0 | 31.0 |
Benefits paid |  | (18.9) | (23.7) |
Acquired |  | 0.0 | 0.0 |
Settlement |  | (327.9) | 0.0 |
Foreign currency translation |  | 0.0 | 0.0 |
Benefit obligation – December 31 |  | 15.5 | 310.4 | 291.8
International Plan [Member] | Pension Plan [Member] |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation – January 1 |  | 98.4 | 89.4 |
Service cost |  | 1.5 | 1.2 | 1.3
Interest cost |  | 1.0 | 1.5 | 1.4
Amendments |  | 0.0 | 0.0 |
Actuarial loss(a) |  | 3.3 | 10.4 |
Benefits paid |  | (3.6) | (3.0) |
Acquired |  | 0.0 | 0.5 |
Settlement |  | (0.6) | 0.0 |
Foreign currency translation |  | 9.0 | (1.6) |
Benefit obligation – December 31 |  | $ 109.0 | $ 98.4 | $ 89.4
[1] | In 2020, the actuarial loss is primarily due to a decrease in discount rates in addition to the annuity premium in connection with the U.S. qualified pension plan termination. In 2019, the actuarial loss was primarily due to a reduction in the discount rate used to measure the benefit obligations.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(8) -URI http://asc.fasb.org/extlink&oid=118255775&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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