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Subsequent Event (Details) | Dec. 20, 2018 USD ($) subsidiary | Oct. 31, 2018 USD ($) | Dec. 19, 2012 USD ($) | Jul. 28, 2009 USD ($)
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Subsequent Event |  |  |  |
ERROR in label resolution. |  |  |  |
Number of subsidiaries in merger agreement | subsidiary | 2 |  |  |
Purchase price | $ 1,800,000,000 |  |  |
Senior Secured Term Loan Facility | Subsequent Event |  |  |  |
ERROR in label resolution. |  |  |  |
Amount of debt | 1,200,000,000.0 |  |  |
Line of Credit | Senior Secured Backstop Credit Facility | Subsequent Event |  |  |  |
ERROR in label resolution. |  |  |  |
Credit facility borrowing capacity | 199,000,000 |  |  |
Line of Credit | Credit Agreement |  |  |  |
ERROR in label resolution. |  |  |  |
Credit facility borrowing capacity |  |  | $ 1,000,000,000.0 |
Bridge Loan | Credit Agreement | Subsequent Event |  |  |  |
ERROR in label resolution. |  |  |  |
Credit facility borrowing capacity | 700,000,000.0 |  |  |
Senior Notes | Scenario, Forecast |  |  |  |
ERROR in label resolution. |  |  |  |
Amount of debt | $ 700,000,000.0 |  |  |
Senior Notes due 2019 |  |  |  |
ERROR in label resolution. |  |  |  |
Amount of debt |  | $ 250,000,000.0 |  | $ 250,000,000

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