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Derivative Instruments and Hedging Activities Net Investment Hedge Activity (Tables)
 3 Months Ended
Sep. 30, 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 months ended September 30, 2017 and September 30, 2016.
 
Three Months Ended  
 September 30,
(Dollars in millions)
2017
 
2016
Unrealized foreign exchange gain/(loss) within other
     comprehensive income
$
(17.6
)
 
$
(3.5
)
Unrealized foreign exchange gain/(loss) within statement
     of operations
$
(13.4
)
 
$
(2.5
)