Income Taxes - Additional information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes
Income tax expense at U.S. federal statutory rate			21.00%	21.00%	21.00%
Equity in net losses of unconsolidated entities			$ 60.0	$ 67.0	$ 36.0
Permanent differences increase (decrease)			34.0	14.0	2.0
Reduction in provision for income taxes due to tax audit settlements			5.0	6.0	13.0
Reduction in provision for income taxes due to state net operating losses and credits			20.0	8.0	15.0
Excess tax benefits associated with equity-based compensation			14.0	17.0	18.0
Increase (decrease) in provision for income taxes due to impairments			50.0
Low income housing investments [Member]
Income Taxes
Equity in net losses of unconsolidated entities			66.0	65.0	51.0
Income tax benefit from low-income housing investments			108.0	99.0	74.0
Interest expense			$ 15.0	$ 14.0	$ 9.0
Consideration for investment	$ 260.0
Investment cash payment	20.0
Interest payable	57.0
Increase (decrease) investments in unconsolidated entities	$ 203.0
2017 Audit [Member]
Income Taxes
Income tax deposit paid		$ 103.0