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DERIVATIVE INSTRUMENTS - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Aug. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Cash received during the period for settlement of interest rate swaps (See Note 13) $ 43,200,000 $ 0    
Accumulated other comprehensive income (loss)     $ 110,800,000 $ 158,800,000
Foreign exchange forward contracts        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Cash flow hedges in AOCI, net of tax     32,700,000 31,700,000
Cash flow hedge to be reclassified during next 12 months     10,600,000  
Foreign exchange forward contracts | Other Foreign Currency Translation Adjustments | Net investment hedge        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Accumulated other comprehensive income (loss)     119,300,000 115,000,000
Designated as Hedging Instrument | Interest rate swap contracts | Interest Rate Risk        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Notional amount     $ 2,000,000,000.0 $ 2,000,000,000.0