Changes in Accumulated Other Comprehensive Income by Component - Summary of Changes in Accumulated Balances for Each Component of Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning	$ 10.3	$ 4.2
Other comprehensive income before reclassifications	(4.6)	(1.8)
Amounts reclassified from accumulated other comprehensive income	0	0.1
Balance, ending	5.7	2.5
Foreign Currency Translation [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning	13.6	7.6
Other comprehensive income before reclassifications	(4.5)	(1.7)
Amounts reclassified from accumulated other comprehensive income	0	0
Balance, ending	9.1	5.9
Available-for-Sale Securities [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning	1.9	1.1
Other comprehensive income before reclassifications	(0.1)	(0.1)
Amounts reclassified from accumulated other comprehensive income	0	0
Balance, ending	1.8	1.0
Pension and Post-Retirement Liabilities [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning	(5.2)	(4.5)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	0	0.1
Balance, ending	$ (5.2)	$ (4.4)