Schedule of Income subject to domestic and foreign taxation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax [Abstract]
Income Before Tax, Domestic	$ 1,492.8	$ 957.0	$ 924.7
Income Before Tax, Foreign	138.6	106.0	39.3
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,631.4	1,063.0	964.0
Current Tax Expense (Benefit), Domestic	306.5	180.7	(98.4)
Current State and Local Tax Expense (Benefit)	12.7	2.6	1.5
Current Tax Expense (Benefit), Foreign	154.3	29.5	(19.7)
Income Tax (Benefit) - Current	473.5	212.8	(116.6)
Deferred Tax Expense (Benefit), Federal	20.9	13.3	250.5
Deferred State and Local Income Tax Expense (Benefit)	1.1	(2.2)	1.0
Deferred Tax Expense (Benefit), Foreign	(178.3)	14.9	36.1
Deferred Income Tax Expense (Benefit)	(156.3)	26.0	287.6
Income Tax Expense	$ 317.2	$ 238.8	$ 171.0