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Derivative Instruments and Hedging Activities Net Investment Hedge Activity (Tables)
 9 Months Ended
Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Schedule of Net Investment Hedge in Accumulated Other Comprehensive Income (Loss) and Statement of Financial Performance
The following table includes net investment hedge activity during the three and nine months ended March 31, 2017 and March 31, 2016.
 
Three Months Ended  
 March 31,
 
Nine Months Ended  
 March 31,
(Dollars in millions)
2017
 
2016
 
2017
 
2016
Unrealized foreign exchange gain/(loss) within other
     comprehensive income
$
(13.9
)
 
$
(4.1
)
 
$
(3.9
)
 
$
(1.6
)
Unrealized foreign exchange gain/(loss) within statement
     of operations
$
(13.5
)
 
$
(3.1
)
 
$
(5.9
)
 
$
1.3