CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Comprehensive Income Net Of Tax [Abstract]
Net income/(loss)	$ 27.0	$ (19.3)	$ 62.5	$ (45.3)
Foreign currency translation adjustment	3.7	32.0	(22.5)	20.3
Defined benefit pension plan adjustments			(1.2)
Comprehensive income/(loss)	$ 30.7	$ 12.7	$ 38.8	$ (25.0)