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Income Before Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Domestic $ 881.1 $ 902.3 $ 923.7
Foreign 81.3 76.6 47.2
Income before taxes as reported in the statements of income $ 962.4 $ 978.9 $ 970.9