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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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