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Debt - Schedule of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt | $ 2,490.4 | $ 2,312.1
Senior bank debt |  |
Debt Instrument [Line Items] |  |
Debt | 349.9 | 349.8
Senior notes |  |
Debt Instrument [Line Items] |  |
Debt | 1,093.5 | 1,091.9
Junior subordinated notes |  |
Debt Instrument [Line Items] |  |
Debt | 751.4 | 556.4
Junior convertible securities |  |
Debt Instrument [Line Items] |  |
Debt | $ 295.6 | $ 314.0

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