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STOCKHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Loss) Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | $ (305.3) | $ (320.9) | $ (341.6) | $ (228.5)
Other comprehensive income (loss) before reclassifications | (52.6) | (81.0) | (19.8) | (167.9)
Amounts reclassified from AOCI | 0.6 | 0.6 | 4.1 | (4.9)
Net other comprehensive income (loss) | (52.0) | (80.4) | (15.7) | (172.8)
Ending balance | (357.3) | (401.3) | (357.3) | (401.3)
CTA |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (250.0) | (278.9) | (285.5) | (188.0)
Other comprehensive income (loss) before reclassifications | (60.9) | (80.8) | (25.4) | (171.3)
Amounts reclassified from AOCI | 0.0 | 0.0 | 0.0 | (0.4)
Net other comprehensive income (loss) | (60.9) | (80.8) | (25.4) | (171.7)
Ending balance | (310.9) | (359.7) | (310.9) | (359.7)
Derivative Hedging Adj. |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (4.4) | 0.8 | (6.4) | 4.0
Other comprehensive income (loss) before reclassifications | 7.1 | (2.1) | 6.6 | 0.5
Amounts reclassified from AOCI | 0.1 | 0.3 | 2.6 | (5.5)
Net other comprehensive income (loss) | 7.2 | (1.8) | 9.2 | (5.0)
Ending balance | 2.8 | (1.0) | 2.8 | (1.0)
Debt & Equity Securities Adj. |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (3.2) | (2.9) | (3.5) | 0.0
Other comprehensive income (loss) before reclassifications | (0.6) | (1.0) | (0.3) | (3.9)
Amounts reclassified from AOCI | 0.0 | 0.0 | 0.0 | 0.0
Net other comprehensive income (loss) | (0.6) | (1.0) | (0.3) | (3.9)
Ending balance | (3.8) | (3.9) | (3.8) | (3.9)
Pension Liability Adj. |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (47.7) | (39.9) | (46.2) | (44.5)
Other comprehensive income (loss) before reclassifications | 1.8 | 2.9 | (0.7) | 6.8
Amounts reclassified from AOCI | 0.5 | 0.3 | 1.5 | 1.0
Net other comprehensive income (loss) | 2.3 | 3.2 | 0.8 | 7.8
Ending balance | $ (45.4) | $ (36.7) | $ (45.4) | $ (36.7)

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