Fair Value Measurements (Fair Value Of Notes Payable) (Details) - USD ($)		Mar. 31, 2026		Dec. 31, 2025
Carrying Value	[1]	$ 4,250,500,000		$ 3,900,800,000
Fixed rate notes payable
Carrying Value		3,349,700,000		2,766,900,000
Estimated Fair Value		3,168,100,000		2,629,600,000
Floating rate notes payable (1)
Carrying Value		900,800,000	[2]	1,100,000,000
Estimated Fair Value	[2]	$ 903,900,000		1,140,900,000
Floating Rate Notes Payable CV
Carrying Value	[2]			$ 1,133,900,000

[1] Balances are decreased by unamortized debt discounts, debt issuance costs, and fair market value adjustments, net of $17.3 million and $10.1 million as of March 31, 2026 and December 31, 2025, respectively.

[2] Includes the senior unsecured notes payable and a term loan due in 2026, and the commercial paper notes at March 31, 2026 and December 31, 2025.