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

Fair Value Measurements - Borrowing Rates (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Jul. 09, 2019
Derivatives, Fair Value [Line Items]
Nominal Unpaid Principal Balance	$ 1,670,800,000
Estimate of fair value measurement
Derivatives, Fair Value [Line Items]
Aggregate Fair Value	1,276,400,000	$ 1,265,000,000.0
2027 Notes \| Senior Notes
Derivatives, Fair Value [Line Items]
Nominal Unpaid Principal Balance	$ 1,200,000,000.0	$ 1,200,000,000.0	$ 1,200,000,000