Annual report pursuant to Section 13 and 15(d)

INCOME TAXES Income Taxes (Schedule of Valuation Allowance) (Details)

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INCOME TAXES Income Taxes (Schedule of Valuation Allowance) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Valuation Allowance [Line Items]        
Deferred Tax Assets, Valuation Allowance $ 441.3 $ 1,287.3 $ 1,983.1 $ 3,095.1
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   (695.8)    
Included in income tax expense (benefit) [Member]        
Valuation Allowance [Line Items]        
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (846.0) (691.3) (1,120.0)  
Change in deferred assets in other comprehensive income [Member]        
Valuation Allowance [Line Items]        
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 0.0 (4.5) (9.8)  
Acquisition of noncontrolling interest [Member]        
Valuation Allowance [Line Items]        
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 0.0 $ 0.0 $ 17.8