Changes in Accumulated Other Comprehensive Income by Component Summary of Components of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	$ 927.8	$ 961.7	$ 816.0
Other comprehensive income/(loss) before reclassifications	(17.7)	(31.5)	5.8
Amounts reclassified from accumulated other comprehensive income/(loss)	(0.4)	(0.3)	(0.3)
Balance	1,045.5	927.8	961.7
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(16.6)	13.6	7.6
Other comprehensive income/(loss) before reclassifications	(15.4)	(30.2)	6.0
Amounts reclassified from accumulated other comprehensive income/(loss)	0.0	0.0	0.0
Balance	(31.9)	(16.6)	13.6
Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	2.0	1.9	1.1
Other comprehensive income/(loss) before reclassifications	(0.7)	0.1	0.8
Amounts reclassified from accumulated other comprehensive income/(loss)	0.0	0.0	0.0
Balance	1.3	2.0	1.9
Pension and Post-Retirement Liabilities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(6.3)	(5.2)	(4.5)
Other comprehensive income/(loss) before reclassifications	(1.6)	(1.4)	(1.0)
Amounts reclassified from accumulated other comprehensive income/(loss)	(0.4)	(0.3)	(0.3)
Balance	(7.6)	(6.3)	(5.2)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(20.9)	10.3	4.2
Balance	$ (38.2)	$ (20.9)	$ 10.3