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Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Fair Value, Assets and Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation (Details)

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FAIR VALUE MEASUREMENTS - Fair Value, Assets and Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Ìý Ìý Ìý Ìý
Beginning balance $ 35.3 $ 118.1 $ 45.8 $ 91.4
Included in earnings 29.5 (6.5) 43.3 83.1
Settlements (3.4) (38.8) (27.7) (101.7)
Ending balance 61.4 72.8 61.4 72.8
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) on assets still held at the reporting date 27.8 (6.5) 40.4 81.8
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Ìý Ìý Ìý Ìý
Beginning balance 0.0 0.0 (1.1) 0.0
Included in earnings (0.3) (34.4) (0.9) (39.7)
Settlements 0.0 4.2 1.7 9.5
Ending balance (0.3) (30.2) (0.3) (30.2)
Total losses for the period included in earnings attributable to the change in unrealized losses on liabilities still held at the reporting date $ (0.3) $ (30.2) $ (0.3) $ (30.2)