Changes in Accumulated Other Comprehensive Income by Component - Summary of Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax income	$ 0.8	$ 0.7	$ 0.5
Amortization of loss, net of tax	0.4	0.3	0.3
Pension and Post-Retirement Liabilities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of loss, net of tax	0.4	0.3	0.3
Pension and Post-Retirement Liabilities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of loss reclassified into Selling, general and administrative expenses	0.6	0.5	0.5
Tax income	(0.2)	(0.2)	(0.2)
Amortization of loss, net of tax	$ 0.4	$ 0.3	$ 0.3