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Earnings Per Share - Computations of Earnings (Loss) per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 204.2	$ 202.1	$ 577.1	$ 597.1
Basic earnings per common share	$ 1.58	$ 1.47	$ 4.40	$ 4.32
Diluted earnings per common share	$ 1.57	$ 1.45	$ 4.37	$ 4.26
Basic average shares outstanding	129.3	137.8	131.0	138.3
Stock-based awards	0.8	1.9	1.0	1.9
Diluted average shares outstanding	130.1	139.7	132.0	140.2
Antidilutive stock-based awards excluded from weighted- average number of shares outstanding for diluted earnings per share	1.6	0.4	1.2	0.3

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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