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Long-Term Debt - Narrative (Details)	1 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Notes payable		$ 414,000,000	$ 425,000,000
Undrawn Letter Of Credit		$ 16,000,000
Interest coverage ratio		3
Maximum ratio		4
Minimum
Debt Instrument [Line Items]
Interest coverage ratio		3.5
Maximum
Debt Instrument [Line Items]
Interest coverage ratio		3.5
2018 Credit Agreement
Debt Instrument [Line Items]
Fee Amount	$ 4,000,000
Debt Issuance Costs, Gross	3,000,000
Amortization And Write-Off Of Debt Issuance Costs	2,000,000
2018 Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility amount	75,000,000
2018 Revolver | Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility amount	250,000,000
Tranche A and Tranche A-2 Term Loans | Notes Payable
Debt Instrument [Line Items]
Refinanced term loans	415,000,000
Notes payable	415,000,000
Extinguishment of debt	204,000,000
2018 Term Loan A | Notes Payable
Debt Instrument [Line Items]
New term loan	425,000,000
Notes payable		$ 414,000,000	$ 0
Debt Modification, Refinancing, Amount From Refinanced Borrowing Included In New Borrowing	$ 211,000,000

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