Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($) $ in Millions		Dec. 31, 2025	Dec. 31, 2024
Notes Payable	[1]	$ 3,900.8	$ 3,485.6
Fixed Rate Notes Payable [Member]
Notes Payable		2,766.9	2,764.4
Estimated Fair Value		2,629.6	2,528.6
Floating Rate Notes Payable [Member]
Notes Payable	[2]	1,133.9	721.2
Estimated Fair Value	[2]	$ 1,140.9	$ 733.0

[1] Balances are decreased by unamortized debt discounts, debt issuance costs, and fair market value adjustments, net of $10.1 million and $13.3 million as of December 31, 2025 and 2024, respectively.

[2] Includes the senior unsecured notes payable and a term loan due in 2026 at December 31, 2025 and 2024. At December 31, 2025, the floating rate notes payable also includes the commercial paper notes. At December 31, 2024, it also reflects outstanding balances under our unsecured revolving credit facility.