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FAIR VALUE MEASUREMENT - Fair Value Hierarchy for Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets:
Note receivable - building sale	$ 6.3	$ 6.2
Total assets	112.2	116.5
Level 1
Assets:
Note receivable - building sale	0.0	0.0
Total assets	105.9	110.3
Level 2
Assets:
Note receivable - building sale	0.0	0.0
Total assets	0.0	0.0
Level 3
Assets:
Note receivable - building sale	6.3	6.2
Total assets	6.3	6.2
Fair Value, Recurring
Assets:
Note receivable - building sale	6.3	6.2
Total assets	112.2	116.5
Fair Value, Recurring | US Treasury Securities
Assets:
Debt securities	78.0	70.0
Fair Value, Recurring | Mutual funds
Assets:
Marketable securities	22.9	23.8
Fair Value, Recurring | Money market funds
Assets:
Marketable securities	5.0	16.5
Fair Value, Recurring | Level 1
Assets:
Note receivable - building sale	0.0	0.0
Total assets	105.9	110.3
Fair Value, Recurring | Level 1 | US Treasury Securities
Assets:
Debt securities	78.0	70.0
Fair Value, Recurring | Level 1 | Mutual funds
Assets:
Marketable securities	22.9	23.8
Fair Value, Recurring | Level 1 | Money market funds
Assets:
Marketable securities	5.0	16.5
Fair Value, Recurring | Level 2
Assets:
Note receivable - building sale	0.0	0.0
Total assets	0.0	0.0
Fair Value, Recurring | Level 2 | US Treasury Securities
Assets:
Debt securities	0.0	0.0
Fair Value, Recurring | Level 2 | Mutual funds
Assets:
Marketable securities	0.0	0.0
Fair Value, Recurring | Level 2 | Money market funds
Assets:
Marketable securities	0.0	0.0
Fair Value, Recurring | Level 3
Assets:
Note receivable - building sale	6.3	6.2
Total assets	6.3	6.2
Fair Value, Recurring | Level 3 | US Treasury Securities
Assets:
Debt securities	0.0	0.0
Fair Value, Recurring | Level 3 | Mutual funds
Assets:
Marketable securities	0.0	0.0
Fair Value, Recurring | Level 3 | Money market funds
Assets:
Marketable securities	$ 0.0	$ 0.0

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- Definition

Fair value portion of asset recognized for present right to economic benefit.

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Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

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