Segment Reporting - Reconciliation of Reportable Segment ROA Pre-Tax Profit to Consolidated Income before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting [Line Items]
Income before income taxes	$ 531.2	$ 440.6	$ 1,481.6	$ 1,270.4
U.S. reportable segment
Segment Reporting [Line Items]
U.S. ROA pre-tax profit	456.9	380.5	1,271.8	1,100.2
Other operating segment
Segment Reporting [Line Items]
Other operating segment pre-tax profit	$ 74.3	$ 60.1	$ 209.7	$ 170.2

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