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SCHEDULE II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Allowance, Credit Loss |  |  |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |  |  |
Balance at Beginning of Year | [1] | $ 1.1 |  | $ 0.8 |  | $ 0.8 |
Charged to Costs and Expenses | [1] | 1.0 |  | 0.6 |  | 0.4 |
Charged to Other Accounts | [1] | 0.0 |  | 0.0 |  | 0.0 |
Deductions | [1],[2] | (0.5) |  | (0.3) |  | (0.4) |
Balance at End of Year | [1] | 1.6 |  | 1.1 |  | 0.8 |
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 | [1] | 10.6 |  | 7.7 |  | 5.9 |
Charged to Costs and Expenses | [1] | 0.0 |  |  |  | 1.4 |
Charged to Other Accounts | [1] | (1.2) | [3] | 1.2 | [4] | 0.5 | [5]
Deductions | [1] | 0.0 |  | (0.5) |  | (0.1) |
Balance at End of Year | [1] | $ 9.4 |  | $ 10.6 |  | $ 7.7 |
[1] | Relates to continuing operations only.
[2] | Represents amounts written off, net of related recoveries.
[3] | The amount reflected in the year ended December 31, 2018 represents amounts recognized in Accumulated other comprehensive loss and other adjustments that had no net impact on Income tax expense in the year.
[4] | The amount reflected in the year ended December 31, 2017 represents amounts recognized in Accumulated other comprehensive loss and other adjustments, such as the recognition of additional valuation allowance associated with the revaluation of state deferred tax assets as a result of the 2017 Tax Act, that had no net impact on Income tax expense in the year
[5] | The $0.5 million reflected in the year ended December 31, 2016 represents amounts reclassified from discontinued operations during the year.

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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) -URI http://asc.fasb.org/extlink&oid=26873400&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) -URI http://asc.fasb.org/extlink&oid=26873400&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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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