Fair Value Measurements (Other Fair Value Disclosures) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Level 2 [Member] \| Senior Unsecured Notes [Member]
Other Fair Value Measurements
Senior unsecured notes	$ 806.9	$ 1,093.4

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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+ Details