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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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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

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