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INCOME TAXES - Reconciliation of Total Amounts of Unrecognized Tax Benefits Excluding Interest and Penalties (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Taxes [Line Items] |  |  |
Beginning Balance | $ 55.8 | $ 55.9 | $ 46.5
Gross increases - tax positions in prior periods | 2.2 | 0.0 | 7.7
Gross decreases - tax positions in prior periods | (5.1) | (0.2) | (1.6)
Gross increases - current period tax positions | 0.2 | 0.1 | 3.4
Statute of limitations expiration | (0.2) | 0.0 | (0.1)
Ending Balance | 52.9 | 55.8 | 55.9
CUSA |  |  |
Income Taxes [Line Items] |  |  |
Beginning Balance | 53.9 | 54.0 | 46.5
Gross increases - tax positions in prior periods | 2.2 | 0.0 | 5.8
Gross decreases - tax positions in prior periods | (5.1) | (0.2) | (1.6)
Gross increases - current period tax positions | 0.2 | 0.1 | 3.4
Statute of limitations expiration | (0.2) | 0.0 | (0.1)
Ending Balance | $ 51.0 | $ 53.9 | $ 54.0

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-10B + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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