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Supplemental Cash Flow Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Open reverse repurchase commitments	$ 0	$ 0	$ 0
Operating lease liabilities	45,600,000	29,700,000
Income taxes	413,000,000.0	595,900,000
Interest	213,500,000	191,300,000
Operating lease liabilities	57,200,000	62,500,000
Cash and Cash Equivalents
Open reverse repurchase commitments	79,700,000	123,000,000	$ 125,900,000
Common equities | Quarterly dividend
Common share dividends	$ 58,500,000	$ 58,500,000

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