Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Name:	us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Investments in Unconsolidated Affiliates - Earnings of Unconsolidated Entities (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Feb. 15, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of Equity Method Investments [Line Items]
Non-cash gain related to DNB's issuance of common stock, net of tax					$ 9.9
Equity in (losses) earnings of unconsolidated affiliates, net of tax		$ (0.1)	$ (5.0)	$ 303.0	1.4
D&B Investment
Schedule of Equity Method Investments [Line Items]
Gain related to DNB investment, net of tax	$ 305.4			305.4
Equity in (losses) earnings of unconsolidated affiliates, net of tax		(0.1)	(5.0)	303.0	1.4
D&B Investment \| Prior to change in accounting policy
Schedule of Equity Method Investments [Line Items]
Equity in (losses) earnings of unconsolidated affiliates, net of tax		$ (0.1)	$ (5.0)	$ (2.4)	$ (8.5)