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SUPPLEMENTAL CASH FLOW INFORMATION - ADOPTION OF ACCOUNTING STANDARDS UPDATES (Details)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Provisions
Sep. 30, 2017
USD ($)
Adoption of accounting standards updates    
Net cash used in investing activities $ 1,720.0 $ 1,565.8
Accounting Standards Update 2016-18 | Impact of ASU 2016-18    
Adoption of accounting standards updates    
Net cash used in investing activities   13.8
Accounting Standards Update 2016-15    
Adoption of accounting standards updates    
Number of provisions in ASU 2016-15 | Provisions 8  
Impact on financial statements from adoption $ 0.0 $ 0.0