Intangible Assets - Changes in the Carrying Amount of Goodwill by Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill
Beginning balance	$ 2,234.9	$ 2,154.7
Additions	175.8	95.9
Disposals	(9.0)	0.0
Impairment	0.0	(40.7)	$ 0.0
Foreign currency translation	(30.4)	25.0
Ending balance	2,371.3	2,234.9	2,154.7
Retail Automotive
Goodwill
Beginning balance	1,664.0	1,617.6
Additions	162.5	64.3
Disposals	(6.0)	0.0
Impairment		(40.7)
Foreign currency translation	(16.7)	22.8
Ending balance	1,803.8	1,664.0	1,617.6
Retail Commercial Truck
Goodwill
Beginning balance	494.3	462.3
Additions	13.3	29.9
Disposals	(3.0)	0.0
Impairment		0.0
Foreign currency translation	(7.1)	2.1
Ending balance	497.5	494.3	462.3
Other
Goodwill
Beginning balance	76.6	74.8
Additions	0.0	1.7
Disposals	0.0	0.0
Impairment		0.0
Foreign currency translation	(6.6)	0.1
Ending balance	$ 70.0	$ 76.6	$ 74.8