Changes in Accumulated Other Comprehensive Income/(Loss) by Component- Summary of Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of loss, net of tax	$ (0.6)	$ (0.4)	$ (0.3)
Pension and Post- Retirement Liabilities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of loss, net of tax	(0.6)	(0.4)	(0.3)
Pension and Post- Retirement Liabilities | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of loss reclassified into Selling, general and administrative expenses	1.0	0.6	0.5
Tax income	(0.4)	(0.2)	(0.2)
Amortization of loss, net of tax	$ 0.6	$ 0.4	$ 0.3