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
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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) - USD ($)	Sep. 30, 2020	Dec. 31, 2019	Dec. 22, 2017	Nov. 30, 2016
Debt Instrument [Line Items]
Long-term debt, gross		$ 3,585,200,000
Term Loan due 2023 \| Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate principal amount			$ 325,000,000.0	$ 2,320,000,000.0
Long-term debt, gross	$ 0	$ 2,070,000,000.0