Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss	$ 30.2	$ 0.0
Amortization of other intangible assets	39.8	28.3	$ 21.8
Fresh Insurance Services Group Limited
Finite-Lived Intangible Assets [Line Items]
Loss on sale	$ 28.7
Impairments of other intangible assets			2.4
UK Vertical
Finite-Lived Intangible Assets [Line Items]
Impairments of other intangible assets		$ 6.2
Other Operations
Finite-Lived Intangible Assets [Line Items]
Impairments of other intangible assets			0.4
Goodwill, impairment loss			$ 7.6