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Stock-Based Compensation - Pre-Tax Stock-Based Compensation Expense from Continuing Operations (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 37.2 $ 43.6 $ 32.0
Tax benefit 6.2 15.2 11.4
Total after tax expense 31.0 28.4 20.6
Stock Option Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation 8.6 7.4 7.2
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation 21.3 21.6 17.2
Performance Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation 6.3 13.6 6.7
Director Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 1.0 $ 1.0 $ 0.9