Condensed Consolidated Statements of Earnings and Comprehensive Earnings - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Condensed Consolidated Statements of Earnings and Comprehensive Earnings
Revenues	$ 386.7	$ 378.0	$ 1,168.4	$ 1,089.0
Expenses:
Operating expenses	220.9	203.0	645.6	586.2
Depreciation and amortization	93.5	93.6	277.5	271.8
Transition and integration costs	4.1	(1.3)	19.9	10.9
Total expenses	318.5	295.3	943.0	868.9
Operating income	68.2	82.7	225.4	220.1
Other income and expense:
Interest expense, net	(26.6)	(21.6)	(70.3)	(62.8)
Other expense, net	(5.4)	(1.1)	(9.0)	(5.3)
Total other expense, net	(32.0)	(22.7)	(79.3)	(68.1)
Earnings before income taxes and equity in earnings of unconsolidated affiliates	36.2	60.0	146.1	152.0
Income tax expense	6.5	15.3	17.0	31.0
Earnings before equity in earnings of unconsolidated affiliates	29.7	44.7	129.1	121.0
Equity in earnings of unconsolidated affiliates, net of tax	0.3	1.6	303.3	3.0
Net earnings	30.0	46.3	432.4	124.0
Net losses attributable to redeemable noncontrolling interests		7.1	2.5	23.2
Net earnings attributable to Black Knight	30.0	53.4	434.9	147.2
Other comprehensive earnings:
Unrealized holding gains (losses), net of tax(1)	1.4	(0.2)	8.0	0.1
Reclassification adjustments for losses included in net earnings, net of tax(2)	0.4	4.0	5.6	11.9
Total unrealized gains on interest rate swaps, net of tax	1.8	3.8	13.6	12.0
Foreign currency translation adjustment, net of tax (3)	(0.4)		(1.0)	(0.4)
Unrealized (losses) gains on investments in unconsolidated affiliates, net of tax(4)	(1.9)	(2.9)	(1.1)	(4.5)
Other comprehensive earnings (loss)	(0.5)	0.9	11.5	7.1
Comprehensive earnings	29.5	47.2	443.9	131.1
Net losses attributable to redeemable noncontrolling interests		7.1	2.5	23.2
Comprehensive earnings attributable to Black Knight	$ 29.5	$ 54.3	$ 446.4	$ 154.3
Net earnings per share attributable to Black Knight common shareholders:
Basic	$ 0.19	$ 0.34	$ 2.82	$ 0.95
Diluted	$ 0.19	$ 0.34	$ 2.80	$ 0.94
Weighted average shares of common stock outstanding (see Note 5):
Basic	154.5	155.2	154.4	155.4
Diluted	155.4	156.2	155.5	155.9