Significant Accounting Policies - Equity Instruments and Debt Securities (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2026	Dec. 31, 2025
Equity Instruments and Debt Securities
Equity instruments with readily determinable fair value	$ 32.9	$ 33.7
Equity instruments without readily determinable fair values	331.0	329.1
Debt securities of our captive insurance companies	$ 158.4	$ 161.6
Securities in captive insurance subsidiary portfolio \| Maximum
Equity Instruments and Debt Securities
Short-term investment maturity period	1 year
Investment maturity period	10 years

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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