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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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