Reporting Segments and Related Information - Performance by Reporting Segment (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
TOTAL ASSETS	$ 177,132.7	$ 155,508.4	$ 150,783.1
TOTAL REVENUE	8,086.4	8,290.4	6,773.5
INCOME BEFORE INCOME TAXES	2,339.5	2,659.5	1,464.8
NET INCOME	$ 1,736.9	$ 2,031.1	$ 1,107.3
TOTAL ASSETS \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
TOTAL REVENUE \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
INCOME BEFORE INCOME TAXES \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
NET INCOME \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
Non-U.S.
Segment Reporting Information [Line Items]
TOTAL ASSETS	$ 54,803.5	$ 52,343.8	$ 51,699.4
TOTAL REVENUE	2,434.6	2,123.2	2,085.9
INCOME BEFORE INCOME TAXES	556.6	388.9	473.8
NET INCOME	$ 439.5	$ 307.9	$ 374.6
Non-U.S. \| TOTAL ASSETS \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	31.00%	34.00%	34.00%
Non-U.S. \| TOTAL REVENUE \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	30.00%	26.00%	31.00%
Non-U.S. \| INCOME BEFORE INCOME TAXES \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	24.00%	15.00%	32.00%
Non-U.S. \| NET INCOME \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	25.00%	15.00%	34.00%
U.S.
Segment Reporting Information [Line Items]
TOTAL ASSETS	$ 122,329.2	$ 103,164.6	$ 99,083.7
TOTAL REVENUE	5,651.8	6,167.2	4,687.6
INCOME BEFORE INCOME TAXES	1,782.9	2,270.6	991.0
NET INCOME	$ 1,297.4	$ 1,723.2	$ 732.7
U.S. \| TOTAL ASSETS \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	69.00%	66.00%	66.00%
U.S. \| TOTAL REVENUE \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	70.00%	74.00%	69.00%
U.S. \| INCOME BEFORE INCOME TAXES \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	76.00%	85.00%	68.00%
U.S. \| NET INCOME \| Geographic Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	75.00%	85.00%	66.00%

Amount of asset recognized for present right to economic benefit.

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