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Changes in Accumulated Other Comprehensive Income by Component Summary of Components of AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance $ 10.3 $ 4.2 $ 3.5
Other comprehensive income before reclassifications (31.5) 5.8 0.2
Amounts reclassified from accumulated other comprehensive income 0.3 0.3 0.5
Ending balance (20.9) 10.3 4.2
Foreign Currency Translation [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 13.6 7.6 9.0
Other comprehensive income before reclassifications (30.2) 6.0 (1.4)
Amounts reclassified from accumulated other comprehensive income 0.0 0.0 0.0
Ending balance (16.6) 13.6 7.6
Available-for-Sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 1.9 1.1 0.3
Other comprehensive income before reclassifications 0.1 0.8 0.8
Amounts reclassified from accumulated other comprehensive income 0.0 0.0 0.0
Ending balance 2.0 1.9 1.1
Pension and Post-Retirement Liabilities [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (5.2) (4.5) (5.8)
Other comprehensive income before reclassifications (1.4) (1.0) 0.8
Amounts reclassified from accumulated other comprehensive income 0.3 0.3 0.5
Ending balance $ (6.3) $ (5.2) $ (4.5)