Accrued Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2015	Jun. 30, 2014
Accrued Liabilities, Current [Abstract]
Accrued compensation and benefits	$ 44.3	$ 49.8
Derivative financial instruments	32.7	4.7
Accrued postretirement benefits	14.0	15.5
Accrued interest expense	11.2	11.2
Accrued income taxes	8.7	8.4
Deferred revenue	8.6	7.5
Accrued pension liabilities	3.3	19.3
Other	29.8	31.6
Total accrued liabilities	$ 152.6	$ 148.0