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Debt - Summary of Company's Debt (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt	$ 2,310.8	$ 1,793.8
Senior bank debt
Debt Instrument [Line Items]
Debt	349.8	449.7
Senior notes
Debt Instrument [Line Items]
Debt	1,091.5	743.8
Junior convertible securities
Debt Instrument [Line Items]
Debt	313.1	310.6
Junior subordinated notes
Debt Instrument [Line Items]
Debt	$ 556.4	$ 289.7

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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