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DISCONTINUED OPERATIONS AND ASSETS AND LIABILITIES HELD FOR SALE - Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2014
Cash and cash equivalents:        
Cash and cash equivalents - continuing operations $ 428.5 $ 371.2 $ 626.5  
Cash and cash equivalents - held for sale 73.4 95.3 3.6  
Total cash and cash equivalents: 501.9 466.5 630.1 $ 478.2
Cash Equivalents not immediately available for use 14.0 9.8 $ 0.0  
Non-cash operating items:        
Depreciation and amortization 22.4 55.8    
Deferred taxes 15.8 (2.2)    
Goodwill Impairment 0.0 11.3    
Asset Impairments 3.0 23.9    
Capital expenditures $ (14.9) $ (22.3)