Accrued Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Jun. 30, 2013
Accrued Liabilities
Accrued compensation	$ 42.7	$ 49.4
Accrued postretirement benefits	15.5	15.4
Derivative financial instruments	15.4	29.1
Accrued interest expense	11.2	11.2
Accrued pension liabilities	11.2	9.7
Other	42.2	53.7
Total accrued liabilities	$ 138.2	$ 168.5