CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Comprehensive Income Net Of Tax [Abstract]
Net income/(loss)	$ 19.8	$ (10.8)	$ 35.5	$ (26.0)
Foreign currency translation adjustment	(24.1)	(7.7)	(26.2)	(11.7)
Defined benefit pension plan adjustments			(1.2)
Comprehensive income/(loss)	$ (4.3)	$ (18.5)	$ 8.1	$ (37.7)