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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value Disclosures [Abstract] Ìý Ìý Ìý Ìý
Document Fiscal Year Focus Ìý Ìý 2017 Ìý
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Ìý Ìý Ìý Ìý
Beginning balance $ 72.5 $ 25.8 $ 31.6 $ 7.8
Total gains (losses) Ìý Ìý Ìý Ìý
Included in earnings 60.6 14.6 156.0 62.6
Settlements (43.6) (12.0) (98.1) (42.0)
Ending balance - September 30 89.5 28.4 89.5 28.4
Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date 0.1 8.2 53.4 24.7
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Ìý Ìý Ìý Ìý
Beginning balance (20.9) (2.6) (0.5) (3.4)
Total gains (losses) Ìý Ìý Ìý Ìý
Included in earnings (19.3) (2.9) (64.9) (12.8)
Settlements 30.9 2.8 56.1 13.5
Ending balance - September 30 (9.3) (2.7) (9.3) (2.7)
Total gains (losses) for the period included in earnings attributable to the change in unrealized losses on liabilities still held at the reporting date $ 6.0 $ (2.7) $ (14.8) $ (2.7)