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STOCKHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Loss) Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | $ (315.9) | $ (315.3) | $ (287.1) | $ (341.6)
Other comprehensive income (loss) before reclassifications | (26.7) | 8.4 | (56.3) | 32.8
Amounts reclassified from AOCI | (0.1) | 1.6 | 0.7 | 3.5
Net other comprehensive income (loss) | (26.8) | 10.0 | (55.6) | 36.3
Ending balance | (342.7) | (305.3) | (342.7) | (305.3)
CTA |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (262.2) | (261.1) | (228.3) | (285.5)
Other comprehensive income (loss) before reclassifications | (27.1) | 11.1 | (61.0) | 35.5
Amounts reclassified from AOCI | 0.0 | 0.0 | 0.0 | 0.0
Net other comprehensive income (loss) | (27.1) | 11.1 | (61.0) | 35.5
Ending balance | (289.3) | (250.0) | (289.3) | (250.0)
Derivative Hedging Adj. |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (1.1) | (4.5) | (5.4) | (6.4)
Other comprehensive income (loss) before reclassifications | 0.5 | (1.0) | 4.5 | (0.5)
Amounts reclassified from AOCI | (0.7) | 1.1 | (0.4) | 2.5
Net other comprehensive income (loss) | (0.2) | 0.1 | 4.1 | 2.0
Ending balance | (1.3) | (4.4) | (1.3) | (4.4)
Debt & Equity Securities Adj. |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (2.9) | (3.0) | (2.7) | (3.5)
Other comprehensive income (loss) before reclassifications | 0.0 | (0.2) | (0.2) | 0.3
Amounts reclassified from AOCI | 0.0 | 0.0 | 0.0 | 0.0
Net other comprehensive income (loss) | 0.0 | (0.2) | (0.2) | 0.3
Ending balance | (2.9) | (3.2) | (2.9) | (3.2)
Pension Liability Adj. |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (49.7) | (46.7) | (50.7) | (46.2)
Other comprehensive income (loss) before reclassifications | (0.1) | (1.5) | 0.4 | (2.5)
Amounts reclassified from AOCI | 0.6 | 0.5 | 1.1 | 1.0
Net other comprehensive income (loss) | 0.5 | (1.0) | 1.5 | (1.5)
Ending balance | $ (49.2) | $ (47.7) | $ (49.2) | $ (47.7)

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