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Debt - Schedule of Convertible Securities (Details) - Junior Convertible Trust Preferred Securities - Junior convertible securities - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Contractual interest expense	$ 4.4	$ 5.2	$ 13.9	$ 15.9
Amortization of debt issuance costs	0.1	0.1	0.2	0.2
Amortization of debt discount	0.0	0.8	0.0	2.4
Total	$ 4.5	$ 6.1	$ 14.1	$ 18.5
Effective interest rate	5.21%	6.00%	5.21%	5.99%

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