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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Derivative [Line Items]        
Intercompany debt designated as a non-derivative net investment hedging instrument $ 12.5     $ 11.8
Gain (loss) currency translation adjustment   $ 0.6 $ 0.7  
Foreign Currency Derivatives        
Derivative [Line Items]        
Notional amounts of foreign currency derivatives       $ 12.4
Maximum | Foreign Currency Derivatives        
Derivative [Line Items]        
Derivative maturities April 2016