Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012
Carrying Value
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Long-term debt, including current portion	$ 604.2	$ 406.9
Company-owned life insurance	13.6	11.0
Fair Value
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Long-term debt, including current portion	602.8	427.7
Company-owned life insurance	$ 13.6	$ 11.0