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Defined Benefit Plans - Amounts in Accumulated Other Comprehensive loss that have not yet been Recognized as Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Recognition of actuarial loss | $ (3.2) | $ (34.1) | $ (3.8)
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Recognition of actuarial loss | (70.6) | (121.6) |
Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Recognition of actuarial loss | (0.2) | (1.0) |
Other Accumulated Other Comprehensive Income | Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Beginning Balance | 87.7 | 71.8 |
Recognition of actuarial loss | (2.7) | (34.1) |
Current year actuarial loss | 2.1 | 50.1 |
Net actuarial loss due to curtailment | (0.6) | (0.1) |
Ending Balance | 86.5 | 87.7 | 71.8
Other Accumulated Other Comprehensive Income | Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Beginning Balance | (0.3) | (0.3) |
Recognition of actuarial loss | (0.1) | (0.6) |
Current year actuarial loss | 1.0 | 0.6 |
Ending Balance | $ 0.6 | $ (0.3) | $ (0.3)

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- Definition Defined Benefit Plan Unrecognized Actuarial Net Gains Losses + References No definition available. + Details
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- Definition Defined benefit plan unrecognized net gain loss due to curtailments. + References No definition available. + Details
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- Definition Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + 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/disclosureRef -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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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