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Derivatives (Narrative) (Details)
€ in Millions, $ in Millions
6 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 20, 2016
EUR (€)
Derivative [Line Items]      
Interest rate swaps outstanding $ 0.0    
4.00% Notes, Due October 1, 2026 [Member]      
Derivative [Line Items]      
Notes 477.0 $ 494.7  
Cash Flow Hedging [Member] | Interest Rate Swaps [Member]      
Derivative [Line Items]      
Derivative, fixed interest rate   1.76%  
Notional value   $ 300.0  
Derivative, maturity date   May 01, 2020  
Gain on interest rate swap as a reduction to interest expense $ 3.6    
Cash Flow Hedging [Member] | Commodity Swaps [Member]      
Derivative [Line Items]      
Derivative, maturity date Aug. 01, 2020    
Derivative net (loss) gain estimated to be reclassified from AOCI into earnings over the next 12 months $ 0.1    
Cash Flow Hedging [Member] | Foreign Exchange Contracts [Member]      
Derivative [Line Items]      
Notional value $ 218.2 $ 261.6  
Derivative, maturity date Sep. 01, 2020    
Derivative net (loss) gain estimated to be reclassified from AOCI into earnings over the next 12 months $ 4.5    
Fair Value Hedging [Member]      
Derivative [Line Items]      
Posted cash collateral 0.0 0.0  
Posted standby letters of credit 0.0 0.0  
Net Investment Hedge [Member] | 4.00% Notes, Due October 1, 2026 [Member]      
Derivative [Line Items]      
Notes | €     € 425
Interest rate     4.00%
Not Designated as Hedging [Member] | Foreign Exchange Contracts [Member]      
Derivative [Line Items]      
Notional value $ 1,202.3 $ 105.2