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STOCKHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Loss) Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | $ (315.3) | $ (248.5) | $ (341.6) | $ (228.5)
Other comprehensive income (loss) before reclassifications | 8.4 | (70.8) | 32.8 | (86.9)
Amounts reclassified from AOCI | 1.6 | (1.6) | 3.5 | (5.5)
Net other comprehensive income (loss) | 10.0 | (72.4) | 36.3 | (92.4)
Ending balance | (305.3) | (320.9) | (305.3) | (320.9)
CTA |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (261.1) | (206.9) | (285.5) | (188.0)
Other comprehensive income (loss) before reclassifications | 11.1 | (72.0) | 35.5 | (90.5)
Amounts reclassified from AOCI | 0.0 | 0.0 | 0.0 | (0.4)
Net other comprehensive income (loss) | 11.1 | (72.0) | 35.5 | (90.9)
Ending balance | (250.0) | (278.9) | (250.0) | (278.9)
Derivative Hedging Adj. |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (4.5) | 3.0 | (6.4) | 4.0
Other comprehensive income (loss) before reclassifications | (1.0) | (0.3) | (0.5) | 2.6
Amounts reclassified from AOCI | 1.1 | (1.9) | 2.5 | (5.8)
Net other comprehensive income (loss) | 0.1 | (2.2) | 2.0 | (3.2)
Ending balance | (4.4) | 0.8 | (4.4) | 0.8
Debt & Equity Securities Adj. |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (3.0) | (1.7) | (3.5) | 0.0
Other comprehensive income (loss) before reclassifications | (0.2) | (1.2) | 0.3 | (2.9)
Amounts reclassified from AOCI | 0.0 | 0.0 | 0.0 | 0.0
Net other comprehensive income (loss) | (0.2) | (1.2) | 0.3 | (2.9)
Ending balance | (3.2) | (2.9) | (3.2) | (2.9)
Pension Liability Adj. |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance | (46.7) | (42.9) | (46.2) | (44.5)
Other comprehensive income (loss) before reclassifications | (1.5) | 2.7 | (2.5) | 3.9
Amounts reclassified from AOCI | 0.5 | 0.3 | 1.0 | 0.7
Net other comprehensive income (loss) | (1.0) | 3.0 | (1.5) | 4.6
Ending balance | $ (47.7) | $ (39.9) | $ (47.7) | $ (39.9)

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