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Borrowings - Narrative (Details) |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 23, 2015 USD ($) | Sep. 30, 2018 USD ($) covenant | Dec. 31, 2017 USD ($) | Jun. 13, 2016 USD ($)
Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, term | 5 years |  |  |
Borrowing capacity | $ 700,000,000 |  |  |
Extension period | 1 year |  |  |
Aggregate lending commitments | $ 350,000,000 |  |  |
Applicable margin over LIBOR |  | 1.10% |  |
Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Required percent for prepayment amount of aggregate principal amount |  |  |  | 5.00%
Minimum | Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Applicable margin over LIBOR |  | 0.005% |  |
Maximum | Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Applicable margin over LIBOR |  | 1.50% |  |
3.2% Senior Notes, due June 2023 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Stated interest rate |  | 3.20% |  |
3.37% Senior Notes, due June 2025 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Stated interest rate |  | 3.37% |  |
4.5% Senior Notes, due December 2020 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Stated interest rate |  | 4.50% |  |
4.2% Senior Notes, due December 2021 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Stated interest rate |  | 4.20% |  |
Senior Notes | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Interest coverage ratio |  | 3.0 |  |
Senior Notes | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Limitation of outstanding principal of higher preference debt as percent of consolidated assets |  | 15.00% |  |
Leverage ratio |  | 3.50 |  |
Senior Notes | 3.2% Senior Notes, due June 2023 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Face amount of debt |  |  |  | $ 100,000,000
Stated interest rate |  |  |  | 3.20%
Senior Notes | 3.37% Senior Notes, due June 2025 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Face amount of debt |  |  |  | $ 100,000,000
Stated interest rate |  |  |  | 3.37%
Letters Of Credit | Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Borrowing capacity | 75,000,000 |  |  |
Swing line Loans | Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Borrowing capacity | $ 50,000,000 |  |  |
Revolving Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Current borrowings under revolving facility |  | $ 0 | $ 10,740,000 |
Outstanding letters of credit |  | 9,000,000 |  |
Amount available to borrow |  | $ 691,000,000 |  |
Number of financial covenants | covenant |  | 2 |  |

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