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Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Debt	$ 2,619.7	$ 2,537.5
Senior bank debt
Debt Instrument [Line Items]
Debt	0.0	349.9
Senior notes
Debt Instrument [Line Items]
Debt	1,091.7	1,096.9
Junior subordinated notes
Debt Instrument [Line Items]
Debt	1,189.0	751.8
Junior convertible securities
Debt Instrument [Line Items]
Debt	$ 339.0	$ 338.9

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