Accrued Liabilities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Accrued Liabilities
Accrued compensation and benefits	$ 49.8	$ 62.0
Accrued pension liabilities	19.3	9.7
Accrued postretirement benefits	15.5	15.4
Accrued interest expense	11.2	11.2
Deferred revenue	7.5	5.2
Derivative financial instruments	4.7	29.1
Accrued income taxes	8.4	8.1
Other	31.6	27.8
Total accrued liabilities	$ 148.0	$ 168.5