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	6 Months Ended
	Dec. 31, 2013	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	$ 2.5	$ 4.2
Other comprehensive income before reclassifications	5.6	3.8
Amounts reclassified from accumulated other comprehensive income		0.1
Balance, ending	8.1	8.1
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	5.9	7.6
Other comprehensive income before reclassifications	5.0	3.3
Amounts reclassified from accumulated other comprehensive income
Balance, ending	10.9	10.9
Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	1.0	1.1
Other comprehensive income before reclassifications	0.6	0.5
Amounts reclassified from accumulated other comprehensive income
Balance, ending	1.6	1.6
Pension and Post-Retirement Liabilities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	(4.4)	(4.5)
Other comprehensive income before reclassifications
Amounts reclassified from accumulated other comprehensive income		0.1
Balance, ending	$ (4.4)	$ (4.4)