Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2014
Equity [Abstract]          
Other comprehensive income (loss) $ (23.2) $ 6.4 $ (40.1) $ 30.4  
Currency translation adjustments, accumulated balances $ 45.6   $ 45.6   $ 85.7