Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt - Prior Term Loan Facility (Details) - Term Loan Due 2023 - Revolving Credit Facility - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 22, 2017	Nov. 30, 2016
Debt Instrument [Line Items]
Aggregate principal amount			$ 325.0	$ 2,320.0
Long-term debt, gross	$ 0.0	$ 2,070.0