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Income Taxes - Reconciliation between Federal Statutory Tax Rate to Effective Tax Rate from Continuing Operations (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Income tax expense computed at federal statutory income tax rate $ 153.5 $ 120.8 $ 112.8
Other income taxes, net of federal tax benefit 22.3 18.0 13.7
Foreign taxes at a different rate than U.S. federal statutory income tax rate 3.0 1.4 3.5
Provision for foreign earnings repatriation, net 3.2 0.4 0.6
Net adjustments for uncertain tax positions (0.2) 7.5 4.1
Share-based compensation (ASU 2016-09) (11.5) (3.7) (2.1)
2017 Tax Act impact     5.5
Deferred tax impact of state tax rate changes (0.7) 3.1 3.5
Valuation allowance (decrease) increase (7.1) 3.4 3.0
Expiration of loss carryforwards 6.1    
Miscellaneous other, net 0.2 (6.9) 2.4
Income tax expense as reported $ 168.8 $ 144.0 $ 147.0
Effective income tax rate 23.10% 25.00% 27.40%