Accrued Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2016	Jun. 30, 2015
Accrued Liabilities, Current [Abstract]
Accrued compensation and benefits	$ 41.8	$ 44.3
Derivative financial instruments	31.6	32.7
Accrued postretirement benefits	13.8	14.0
Accrued interest expense	11.2	11.2
Accrued pension liabilities	10.1	3.3
Deferred revenue	8.9	8.6
Accrued income taxes	1.5	8.7
Other	20.3	29.8
Total accrued liabilities	$ 139.2	$ 152.6