Summary of Significant Accounting Policies - Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
2029 Senior Notes
Debt Instrument [Line Items]
Long-term debt, fair value	$ 668.4	$ 672.7
2031 Senior Notes
Debt Instrument [Line Items]
Long-term debt, fair value	$ 618.7	$ 627.1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details