Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, beginning balance	$ 176.5
Goodwill, ending balance	168.8
Goodwill
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, beginning balance	176.5	$ 142.3
Dispositions	(6.7)	0.0
Measurement period adjustments	(1.0)	0.0
Amortization of other intangible assets	0.0	0.0
Goodwill, ending balance	168.8	142.3
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Other intangible assets (excluding goodwill), beginning balance	215.9	198.2
Dispositions	(6.9)	0.0
Measurement period adjustments	0.0	0.0
Amortization of other intangible assets	(1.6)	(1.0)
Other intangible assets (excluding goodwill), ending balance	207.4	197.2
Total Goodwill and Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross (including goodwill), beginning balance	392.4	340.5
Dispositions	(13.6)	0.0
Measurement period adjustments	(1.0)	0.0
Amortization of other intangible assets	(1.6)	(1.0)
Other intangible assets, gross (including goodwill), ending balance	$ 376.2	$ 339.5