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Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Debt	$ 2,620.7	$ 2,620.2
Senior bank debt
Debt Instrument [Line Items]
Debt	0.0	0.0
Senior notes
Debt Instrument [Line Items]
Debt	1,092.5	1,092.1
Junior subordinated notes
Debt Instrument [Line Items]
Debt	1,189.1	1,189.0
Junior convertible securities
Debt Instrument [Line Items]
Debt	$ 339.1	$ 339.1

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