FAIR VALUE MEASUREMENTS - ASSETS AND LIABILITIES MEASURED AT FAIR VALUE ON A RECURRING BASIS (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Level 1
Assets:
Embedded derivative in lease agreement	$ 0.0	$ 0.0
Liabilities:
Redeemable noncontrolling interests	0.0	0.0
Level 1 \| Interest rate swap agreements
Assets:
Interest rate swap agreements	0.0	0.0
Liabilities:
Interest rate swap agreements	0.0	0.0
Fair value of debt related to interest rate swap	35.4	3.3
Level 2
Assets:
Embedded derivative in lease agreement	0.0	0.0
Liabilities:
Redeemable noncontrolling interests	0.0	0.0
Level 2 \| Interest rate swap agreements
Assets:
Interest rate swap agreements	34.8	9.0
Liabilities:
Interest rate swap agreements	0.1	7.5
Fair value of debt related to interest rate swap	0.0	0.0
Level 3
Assets:
Embedded derivative in lease agreement	10.5	10.7
Liabilities:
Redeemable noncontrolling interests	541.4	1,096.5
Level 3 \| Interest rate swap agreements
Assets:
Interest rate swap agreements	0.0	0.0
Liabilities:
Interest rate swap agreements	0.0	0.0
Fair value of debt related to interest rate swap	$ 0.0	$ 0.0

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as an asset.

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The fair value as of the reporting date of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of common shares (regardless of class), limited partnership units (regardless of class), non-preferential membership interests, or any other form of common equity regardless of investee entity legal form.

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