v3.25.2
Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2025
May 15, 2025
Dec. 31, 2024
Long-Term Debt      
Long-term debt principal $ 3,958.6   $ 3,980.4
Net unamortized discount, premium and debt issuance costs (35.6)   (25.1)
Long-term debt carrying amount $ 3,923.0   $ 3,955.3
3.4% notes payable, due 2025      
Long-Term Debt      
Interest rate (as a percent)   3.40% 3.40%
Long-term debt principal     $ 400.0
Net unamortized discount, premium and debt issuance costs     (0.2)
Long-term debt carrying amount     $ 399.8
3.1% notes payable, due 2026      
Long-Term Debt      
Interest rate (as a percent) 3.10%   3.10%
Long-term debt principal $ 350.0   $ 350.0
Net unamortized discount, premium and debt issuance costs (0.4)   (0.7)
Long-term debt carrying amount $ 349.6   $ 349.3
4.111% notes payable, due 2028      
Long-Term Debt      
Interest rate (as a percent) 4.111%    
Long-term debt principal $ 400.0    
Net unamortized discount, premium and debt issuance costs (11.9)    
Long-term debt carrying amount $ 388.1    
3.7% notes payable, due 2029      
Long-Term Debt      
Interest rate (as a percent) 3.70%   3.70%
Long-term debt principal $ 500.0   $ 500.0
Net unamortized discount, premium and debt issuance costs (2.7)   (3.1)
Long-term debt carrying amount $ 497.3   $ 496.9
2.125% notes payable, due 2030      
Long-Term Debt      
Interest rate (as a percent) 2.125%   2.125%
Long-term debt principal $ 600.0   $ 600.0
Net unamortized discount, premium and debt issuance costs (2.5)   (2.8)
Long-term debt carrying amount $ 597.5   $ 597.2
5.375% notes payable, due 2033      
Long-Term Debt      
Interest rate (as a percent) 5.375%   5.375%
Long-term debt principal $ 400.0   $ 400.0
Net unamortized discount, premium and debt issuance costs (3.4)   (3.5)
Long-term debt carrying amount $ 396.6   $ 396.5
6.05% notes payable, due 2036      
Long-Term Debt      
Interest rate (as a percent) 6.05%   6.05%
Long-term debt principal $ 505.6   $ 505.6
Net unamortized discount, premium and debt issuance costs (2.0)   (2.0)
Long-term debt carrying amount $ 503.6   $ 503.6
4.625% notes payable, due 2042      
Long-Term Debt      
Interest rate (as a percent) 4.625%   4.625%
Long-term debt principal $ 300.0   $ 300.0
Net unamortized discount, premium and debt issuance costs (2.7)   (2.7)
Long-term debt carrying amount $ 297.3   $ 297.3
4.35% notes payable, due 2043      
Long-Term Debt      
Interest rate (as a percent) 4.35%   4.35%
Long-term debt principal $ 300.0   $ 300.0
Net unamortized discount, premium and debt issuance costs (2.8)   (2.8)
Long-term debt carrying amount $ 297.2   $ 297.2
4.3% notes payable, due 2046      
Long-Term Debt      
Interest rate (as a percent) 4.30%   4.30%
Long-term debt principal $ 300.0   $ 300.0
Net unamortized discount, premium and debt issuance costs (2.9)   (2.9)
Long-term debt carrying amount $ 297.1   $ 297.1
5.5% notes payable, due 2053      
Long-Term Debt      
Interest rate (as a percent) 5.50%   5.50%
Long-term debt principal $ 300.0   $ 300.0
Net unamortized discount, premium and debt issuance costs (4.2)   (4.3)
Long-term debt carrying amount 295.8   295.7
Secured credit facilities      
Long-Term Debt      
Long-term debt principal     21.8
Long-term debt carrying amount     21.8
Mortgages and notes payable | Non-recourse      
Long-Term Debt      
Long-term debt principal 3.0   3.0
Net unamortized discount, premium and debt issuance costs (0.1)   (0.1)
Long-term debt carrying amount $ 2.9   $ 2.9