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Cumulative Effect of Change in Consolidated Income Statement (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Cost of sales and revenues   $ 4,689.7
Income taxes $ 170.9 137.5
Net income $ 600.5 470.8
Originally Reported    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Cost of sales and revenues   4,690.7
Income taxes   137.2
Net income   470.1
Adjustment    
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]    
Cost of sales and revenues   (1.0)
Income taxes   0.3
Net income   $ 0.7