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Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Apr. 30, 2017 | Jun. 30, 2016
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Schedule of Equity Method Investments [Line Items] |  |  |
Assets held for sale |  | $ 5 |
CARE Ratings Limited |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Fair value method investment, ownership (as a percent) | 8.90% |  |
TRIS Rating Company Limited |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership (as a percent) |  |  | 49.00%
Other Noncurrent Assets | CARE Ratings Limited |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment balance | $ 65 |  |

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