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SCHEDULE II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
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.