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Debt - Summary of Company's Debt (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt	$ 2,044.9	$ 1,793.8
Senior bank debt
Debt Instrument [Line Items]
Debt	699.7	449.7
Senior notes
Debt Instrument [Line Items]
Debt	744.1	743.8
Junior convertible securities
Debt Instrument [Line Items]
Debt	311.4	310.6
Junior subordinated notes
Debt Instrument [Line Items]
Debt	$ 289.7	$ 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.

+ References

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