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Subsequent Events (Details) - USD ($) | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Feb. 21, 2019 | Jan. 31, 2019 | Jan. 28, 2019 | Nov. 30, 2018 | Feb. 19, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Subsequent Event [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 3,200,000,000 | $ 2,900,000,000
Annualized preferred return rate |  |  |  | 9.90% |  |  |
Remaining purchase authority under stock repurchase program |  |  |  |  |  | $ 197,700,000 |
Subsequent Event [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Repayments of debt |  | $ 290,000,000 |  |  |  |  |
Interest rate, stated percentage |  | 5.57% |  |  |  |  |
Payments to acquire related party equity investment | $ 24,500,000 |  |  |  |  |  |
Annualized preferred return rate | 11.00% |  |  |  |  |  |
Shares repurchased during period |  |  | 234,061 |  |  |  |
Value of shares repurchased during period |  |  | $ 57,000,000 |  |  |  |
Share price of shares repurchased during period (in dollars per share) |  |  | $ 243.48 |  |  |  |
Remaining purchase authority under stock repurchase program |  |  |  |  | $ 250,000,000 |  |
Subsequent Event [Member] | Unsecured Notes, 4.0 Interest Rate, Due March 2029 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage | 4.00% |  |  |  |  |  |
Debt instrument, face amount | $ 350,000,000 |  |  |  |  |  |
Debt offering price | 99.188% |  |  |  |  |  |

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