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Debt - Schedule of Convertible Securities (Details) - Junior Convertible Trust Preferred Securities - Junior convertible securities - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Instrument [Line Items]
Contractual interest expense	$ 5.3	$ 4.5	$ 10.7	$ 9.5
Amortization of debt issuance costs	0.1	0.1	0.1	0.1
Amortization of debt discount	0.8	0.0	1.6	0.0
Total	$ 6.2	$ 4.6	$ 12.4	$ 9.6
Effective interest rate	5.20%	5.97%	5.21%	5.98%

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