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SIGNIFICANT ACCOUNTING POLICIES - Leases Standard Impact (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating lease right-of-use assets, net $ 159.3      
Property, plant and equipment, net 802.4   $ 870.6 $ 876.0
Accrued liabilities 629.2   578.9  
Notes payable and current portion of long-term debt 2.3   92.4  
Long-term debt 1,437.8   $ 1,580.0  
Operating Lease, Liability, Noncurrent $ 119.5      
Accounting Standards Update 2016-02        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating lease right-of-use assets, net   $ 167.1    
Property, plant and equipment, net   1.8    
Accrued liabilities   39.4    
Notes payable and current portion of long-term debt   0.2    
Long-term debt   1.5    
Operating Lease, Liability, Noncurrent   $ 126.5