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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING - Summary of Notional Amounts and Fair Value (FY) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Gross notional amount $ 1,583.0 $ 1,184.8
Derivative, Fair Value, Net (1.3) 5.6
Other current assets    
Derivative [Line Items]    
Derivative asset fair value 4.7 5.6
Other current liabilities    
Derivative [Line Items]    
Liabilities at fair value (6.0) 0.0
Designated as Hedging Instrument    
Derivative [Line Items]    
Gross notional amount 787.0 805.1
Derivative, Fair Value, Net (6.0) 3.5
Designated as Hedging Instrument | Other current assets    
Derivative [Line Items]    
Derivative asset fair value 0.0 3.5
Designated as Hedging Instrument | Other current liabilities    
Derivative [Line Items]    
Liabilities at fair value (6.0) 0.0
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Gross notional amount 796.0 379.7
Derivative, Fair Value, Net 4.7 2.1
Not Designated as Hedging Instrument | Other current assets    
Derivative [Line Items]    
Derivative asset fair value 4.7 2.1
Not Designated as Hedging Instrument | Other current liabilities    
Derivative [Line Items]    
Liabilities at fair value $ 0.0 $ 0.0