Supplemental Data (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Cost Data:
Repairs and maintenance costs	$ 99.1	$ 101.8	$ 114.7
Noncash investing and financing activities:
Sale of equity method investment	0.0	12.6	0.0
Noncash purchases of property, equipment and software	13.7	15.1	17.3
Seller financed debt related to the purchase of software	0.0	0.0	4.9
Cash (received) paid during the year for:
Interest payments, net	27.7	27.5	29.0
Income tax (refunds) payment, net	$ (33.3)	$ 27.9	$ (27.1)