Segment Reporting - Reconciliation of Reportable Segment ROA Pre-Tax Profit to Consolidated Income before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Income before income taxes	$ 502.1	$ 436.6	$ 950.4	$ 829.8
U.S. reportable segment
Segment Reporting [Line Items]
U.S. ROA pre-tax profit	431.0	379.3	814.9	719.7
Other operating segment
Segment Reporting [Line Items]
Other operating segment pre-tax profit	$ 71.1	$ 57.3	$ 135.5	$ 110.1

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details