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Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt	$ 2,491.8	$ 2,312.1
Senior bank debt
Debt Instrument [Line Items]
Debt	349.8	349.8
Senior notes
Debt Instrument [Line Items]
Debt	1,093.1	1,091.9
Junior subordinated notes
Debt Instrument [Line Items]
Debt	751.4	556.4
Junior convertible securities
Debt Instrument [Line Items]
Debt	$ 297.5	$ 314.0

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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