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Summary of Significant Accounting Policies - Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Values of Financial Instruments |  |
Total debt | $ 1,659.6 | $ 1,662.4
Senior Unsecured Notes - Publicly Traded |  |
Fair Values of Financial Instruments |  |
Carrying value, before deducting unamortized discount or premiums | 1,650.0 | 1,650.0
Carrying value | 1,640.0 | 1,640.0
Senior Unsecured Notes - Publicly Traded | Level 2 |  |
Fair Values of Financial Instruments |  |
Fair value | $ 1,530.0 | $ 1,750.0

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