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Debt - Components of Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Long-Term Debt |  |
Long-term debt principal | $ 3,958.7 | $ 4,022.7
Net unamortized discount, premium and debt issuance costs | (27.8) | (25.7)
Long-term debt carrying amount | $ 3,930.9 | $ 3,997.0
3.125% notes payable, due 2023 |  |
Long-Term Debt |  |
Interest rate (as a percent) |  | 3.125%
Long-term debt principal |  | $ 300.0
Net unamortized discount, premium and debt issuance costs |  | (0.1)
Long-term debt carrying amount |  | $ 299.9
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 | (0.7) | (1.2)
Long-term debt carrying amount | $ 399.3 | $ 398.8
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 | (1.1) | (1.4)
Long-term debt carrying amount | $ 348.9 | $ 348.6
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 | (3.8) | (4.3)
Long-term debt carrying amount | $ 496.2 | $ 495.7
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 | (3.2) | (3.6)
Long-term debt carrying amount | $ 596.8 | $ 596.4
5.375% notes payable, due 2033 |  |
Long-Term Debt |  |
Interest rate (as a percent) | 5.375% |
Long-term debt principal | $ 400.0 |
Net unamortized discount, premium and debt issuance costs | (3.8) |
Long-term debt carrying amount | $ 396.2 |
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 | (2.1) | (2.3)
Long-term debt carrying amount | $ 503.5 | $ 503.3
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 | (2.8) | (2.9)
Long-term debt carrying amount | $ 297.2 | $ 297.1
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 | (2.9) | (3.0)
Long-term debt carrying amount | $ 297.1 | $ 297.0
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 | (3.0) | (3.1)
Long-term debt carrying amount | $ 297.0 | 296.9
5.5% notes payable, due 2053 |  |
Long-Term Debt |  |
Interest rate (as a percent) | 5.50% |
Long-term debt principal | $ 300.0 |
Net unamortized discount, premium and debt issuance costs | (4.3) |
Long-term debt carrying amount | 295.7 |
Floating rate notes payable, due 2055 |  |
Long-Term Debt |  |
Long-term debt principal |  | 400.0
Net unamortized discount, premium and debt issuance costs |  | (4.5)
Long-term debt carrying amount |  | 395.5
Mortgages and notes payable | Non-recourse |  |
Long-Term Debt |  |
Long-term debt principal | 3.1 | 67.1
Net unamortized discount, premium and debt issuance costs | (0.1) | 0.7
Long-term debt carrying amount | $ 3.0 | $ 67.8

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