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Investments - Dun And Bradstreet Narrative (Details) - USD ($) |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 27, 2019 | Feb. 08, 2019 | Aug. 31, 2019 | Jun. 30, 2019 | Apr. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Reduction in investment |  |  |  |  |  | $ 2,900,000 |
Additional investment |  |  |  |  |  | $ 526,200,000 | $ 0
Dun And Bradstreet Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Additional amount syndicated of Dun & Bradstreet Investment |  |  | $ 500,000 |  | $ 2,600,000 |  |
Ownership |  |  |  |  | 24.30% | 24.30% |
Additional investment | $ 23,500,000 |  |  | $ 23,500,000 |  |  |
Dun And Bradstreet Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Common equity financed from Consortium and Black Knight, Inc. |  | $ 2,100,000,000 |  |  |  |  |
Financed by preferred equity from preferred equity sources |  | 1,100,000,000 |  |  |  |  |
Debt financing from various lenders |  | 4,000,000,000.0 |  |  |  |  |
Dun And Bradstreet Corporation | Cannae | Commitment To Purchase Common Equity of Dun And Bradstreet |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Commitment to purchase |  | $ 900,000,000.0 |  |  |  |  |
Percentage of outstanding common equity |  | 24.50% |  |  |  |  |
Syndication fee income |  |  |  |  |  | $ 9,100,000 |
Dun And Bradstreet Corporation | Cannae | Equity Commitment to Purchase, Retained And Funded | Dun And Bradstreet Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Commitment to purchase |  | $ 505,600,000 |  |  |  |  |

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