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SCHEDULE II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-09, Allowance, Credit Loss |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Year |  | $ 2.4 | $ 1.6 | $ 1.1
Charged to Costs and Expenses |  | 2.4 | 1.9 | 1.0
Charged to Other Accounts | [1] | 0.0 | 0.0 | 0.0
Deductions | [2] | (1.9) | (1.1) | (0.5)
Balance at End of Year |  | 2.9 | 2.4 | 1.6
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Year |  | 8.2 | 9.4 | 10.6
Charged to Costs and Expenses |  | 0.1 | (0.8) | 0.0
Charged to Other Accounts | [1] | 0.5 | (0.4) | (1.2)
Deductions | [2] | 0.0 | 0.0 | 0.0
Balance at End of Year |  | $ 8.8 | $ 8.2 | $ 9.4
[1] | epresents amounts recognized in Accumulated other comprehensive loss and other adjustments that had no net impact on Income tax expense in the year.
[2] | Represents amounts written off, net of related recoveries.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column C)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column D)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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