CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss		$ 128.0	$ 41.6	$ 1,232.2	$ 40.6
Other comprehensive earnings (loss), net of tax:
Unrealized gain on investments and other financial instruments, net (excluding investments in unconsolidated affiliates)	[1]	0.3	0.6	11.5	0.4
Unrealized earnings (loss) of investments in unconsolidated affiliates	[2]	4.8	(4.7)	(1.7)	3.4
Reclassification adjustments for unrealized gains and losses on investments and other financial instruments, net of tax, (excluding investments in unconsolidated affiliates) included in net earnings		0.0	(0.3)	0.0	(0.4)
Reclassification adjustments for unrealized earnings and losses of unconsolidated affiliates, net of tax, included in net earnings	[3]	1.8	4.6	46.2	9.6
Other comprehensive earnings		6.9	0.2	56.0	13.0
Comprehensive earnings		134.9	41.8	1,288.2	53.6
Less: Comprehensive loss attributable to noncontrolling interests		(3.9)	(4.6)	(22.7)	(12.2)
Comprehensive earnings attributable to Cannae Holdings, Inc.		$ 138.8	$ 46.4	$ 1,310.9	$ 65.8

[1] Net of income tax expense of $0.1 million and $0.2 million for the three months ended September 30, 2020 and 2019, respectively, and $3.1 million and $0.1 million for the nine months ended September 30, 2020 and 2019, respectively.

[2] Net of income tax expense (benefit) of $1.3 million and $(1.2) million for the three months ended September 30, 2020 and 2019, respectively, and $(0.4) million and $0.9 million for the nine months ended September 30, 2020 and 2019, respectively.(3)Net of income tax benefit of $0.1 million for the three and nine months ended September 30, 2019.

[3] Net of income tax expense of $0.5 million and $1.2 million for the three months ended September 30, 2020 and 2019, respectively, and $12.3 million and $2.5 million for the nine months ended September 30, 2020 and 2019, respectively.