Investments (Summary of Recorded Revenue) (Details) - VMO2 JV - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Schedule of Equity Method Investments [Line Items]
Total revenue	$ 131.9	$ 95.5	$ 225.1	$ 184.0
Fixed fee
Schedule of Equity Method Investments [Line Items]
Total revenue	58.0	56.7	117.3	110.8
Variable charges
Schedule of Equity Method Investments [Line Items]
Total revenue	$ 73.9	$ 38.8	$ 107.8	$ 73.2

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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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.

+ References

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+ Details