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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Long-Term Debt    
Long-term debt principal $ 4,358.6 $ 3,980.4
Net unamortized discount, premium and debt issuance costs (37.3) (25.1)
Long-term debt carrying amount $ 4,321.3 $ 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 $ 400.0
Net unamortized discount, premium and debt issuance costs   (0.2)
Long-term debt carrying amount $ 400.0 $ 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 (0.5) (0.7)
Long-term debt carrying amount $ 349.5 $ 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 (13.0)  
Long-term debt carrying amount $ 387.0  
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 (2.9) (3.1)
Long-term debt carrying amount $ 497.1 $ 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 (2.6) (2.8)
Long-term debt carrying amount $ 597.4 $ 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 (3.5) (3.5)
Long-term debt carrying amount $ 396.5 $ 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 (4.3) (4.3)
Long-term debt carrying amount 295.7 295.7
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