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INTANGIBLE FRANCHISE RIGHTS AND GOODWILL - Roll-Forward of Goodwill by Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill
Balance	$ 997.1	$ 994.5
Additions through acquisitions	453.5	1.4
Disposals	(4.1)	(2.0)
Reclassified to assets held for sale	(25.0)
Currency translation	(1.3)	3.2
Balance	1,420.2	997.1
U.S.
Goodwill
Balance	901.7	902.3
Additions through acquisitions	434.6	1.4
Disposals	(4.1)	(2.0)
Reclassified to assets held for sale	(25.0)
Currency translation	0.0	0.0
Balance	1,307.3	901.7
Accumulated impairment	40.6
U.K.
Goodwill
Balance	95.4	92.1
Additions through acquisitions	18.9	0.0
Disposals	0.0	0.0
Reclassified to assets held for sale	0.0
Currency translation	(1.3)	3.2
Balance	$ 112.9	$ 95.4

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