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Summary of Significant Accounting Policies - Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Values of Financial Instruments
Total debt	$ 1,151.4	$ 1,659.6
Senior Unsecured Notes - Publicly Traded
Fair Values of Financial Instruments
Carrying value, before deducting unamortized discount or premiums	1,150.0	1,650.0
Carrying value	1,140.0	1,640.0
Senior Unsecured Notes - Publicly Traded | Level 2
Fair Values of Financial Instruments
Fair value	$ 1,070.0	$ 1,530.0

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