INTANGIBLE FRANCHISE RIGHTS AND GOODWILL - Roll-Forward of Intangible Franchise Rights by Reportable Segment (Details) - Intangible Franchise Rights $ in Millions	Dec. 31, 2022 USD ($)
Indefinite-lived Intangible Assets
Balance, December 31, 2021	$ 392.3
Balance, December 31, 2022	516.3
U.S.
Indefinite-lived Intangible Assets
Balance, December 31, 2021	372.0
Balance, December 31, 2022	498.0
U.K.
Indefinite-lived Intangible Assets
Balance, December 31, 2021	20.4
Balance, December 31, 2022	$ 18.3

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Name:	us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant