This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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SIGNIFICANT ACCOUNTING POLICIES - Narrative 4 (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) security jointVenture	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) security jointVenture	Jun. 30, 2023 USD ($)
Summary of Significant Accounting Policies [Line Items]
Number of securities without readily determinable fair value \| security	4		4
Book value of RadNet joint venture interests	$ 9.2		$ 9.2
Number of unconsolidated joint ventures \| jointVenture	13		13
Management service fees	$ 6.1	$ 4.0	$ 12.0	$ 8.2
Dignity Health \| Minimum \| Joint Venture \| Glendale Advanced Imaging
Summary of Significant Accounting Policies [Line Items]
Variable interest entity, ownership percentage			35.00%
Dignity Health \| Maximum \| Joint Venture \| Glendale Advanced Imaging
Summary of Significant Accounting Policies [Line Items]
Variable interest entity, ownership percentage			55.00%