Consolidated Statements of Operations and Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 07, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Foreign currency translation adjustments, tax expense (benefit)	$ 0.1	$ (1.6)	$ 2.9	$ 1.8
Prior service credit (cost), tax benefit		0.1	(0.1)	0.8
Net actuarial gain (loss), tax expense (benefit)	22.2	38.9	(32.2)	(8.1)
Derivative financial instrument, tax expense (benefit)	$ (0.1)	2.8	0.2	$ (0.4)
Dun & Bradstreet Corp
Prior service credit (cost), tax benefit		$ 0.1	$ (0.2)