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Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Debt	$ 2,537.5	$ 2,535.3
Senior bank debt
Debt Instrument [Line Items]
Debt	349.9	349.9
Senior notes
Debt Instrument [Line Items]
Debt	1,096.9	1,095.2
Junior subordinated notes
Debt Instrument [Line Items]
Debt	751.8	751.6
Junior convertible securities
Debt Instrument [Line Items]
Debt	$ 338.9	$ 338.6

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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