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Subsequent Events (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 24, 2015 USD ($) sector | Jun. 29, 2012 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Jun. 30, 2013 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |
Total consideration transferred |  | $ 792,000,000 | $ 0 | $ 0 | $ 792,000,000 |
Maximum borrowing capacity |  |  |  |  |  | $ 1,000,000,000.0
Subsequent Event [Member] | Merger Agreement with SNL [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Total consideration transferred | $ 2,225,000,000 |  |  |  |  |
Number of sectors in global economy that acquiree serves | sector | 5 |  |  |  |  |
Percentage of voting interests planned to be acquired | 100.00% |  |  |  |  |
Subsequent Event [Member] | Merger Agreement with SNL [Member] | Commitment Letter [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 1,000,000,000 |  |  |  |  |

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