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Debt - Narrative (Details) $ in Millions |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 08, 2019 USD ($) | Oct. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) facility
Senior Secured Credit Facility - Original |  |  |
Debt Instrument [Line Items] |  |  |
Debt, aggregate principal amount | $ 469 |  |
Senior Secured Credit Facility - Amended |  |  |
Debt Instrument [Line Items] |  |  |
Commitment Fee |  |  | 0.25%
Letter of Credit | Three Committed Letter of Credit Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Available capacity amount |  |  | $ 28
Number of term loan facilities | facility |  |  | 3
Amount available |  |  | $ 80
Undrawn letters of credit |  |  | 52
Letter of Credit | Ten Million Committed Facility |  |  |
Debt Instrument [Line Items] |  |  |
Maximum Borrowing Capacity |  |  | 10
Letter of Credit | Fifty Four Million Committed Letter Of Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Maximum Borrowing Capacity |  |  | 54
Letter of Credit | Sixteen Million Committed Letter Of Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Maximum Borrowing Capacity |  |  | 16
Letter of Credit | Two Unsecured Letter of Credit Facilities |  |  |
Debt Instrument [Line Items] |  |  |
Available capacity amount |  |  | $ 33
Number of term loan facilities | facility |  |  | 2
Amount available |  |  | $ 55
Undrawn letters of credit |  |  | 22
Letter of Credit | Forty Million Unsecured Letter Of Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Amount available |  |  | 40
Letter of Credit | Fifteen Million Unsecured Letter Of Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Amount available |  |  | $ 15
Minimum | Senior Secured Credit Facility - Amended |  |  |
Debt Instrument [Line Items] |  |  |
Commitment Fee |  |  | 0.15%
Maximum | Senior Secured Credit Facility - Amended |  |  |
Debt Instrument [Line Items] |  |  |
Commitment Fee |  |  | 0.30%
Term Loan A | Senior Secured Credit Facility - Amended |  |  |
Debt Instrument [Line Items] |  |  |
Debt, aggregate principal amount | $ 800 |  |
Quarterly principal payment, percentage | 1.25% |  |
Revolving Credit Facility | Senior Secured Credit Facility - Amended |  |  |
Debt Instrument [Line Items] |  |  |
Maximum Borrowing Capacity | $ 1,000 |  |
Line of credit maturity period | 5 years |  |
Available capacity amount |  |  | $ 782
Senior unsecured notes | Six hundred million senior unsecured notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt, aggregate principal amount |  | $ 600 |
Interest Rate Percentage |  | 4.625% |
Debt maturity period |  | 10 years |
LIBOR | Senior Secured Credit Facility - Amended |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate margin |  |  | 1.75%
LIBOR | Senior Secured Credit Facility - Amended | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate margin |  |  | 1.25%
LIBOR | Senior Secured Credit Facility - Amended | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate margin |  |  | 2.00%
Base Rate | Senior Secured Credit Facility - Amended |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate margin |  |  | 0.75%
Base Rate | Senior Secured Credit Facility - Amended | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate margin |  |  | 0.25%
Base Rate | Senior Secured Credit Facility - Amended | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate margin |  |  | 1.00%

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