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Debt - Summary of Company's Debt (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt	$ 1,793.8	$ 1,829.6
Senior bank debt
Debt Instrument [Line Items]
Debt	449.7	779.7
Senior notes
Debt Instrument [Line Items]
Debt	743.8	742.5
Junior convertible securities
Debt Instrument [Line Items]
Debt	310.6	307.4
Junior subordinated notes
Debt Instrument [Line Items]
Debt	$ 289.7	$ 0.0

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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.

+ References

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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-Section S99
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