Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Jun. 30, 2014
Carrying Value
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Long-term debt	$ 609.8	$ 604.3
Carrying Value | Level 2
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Company-owned life insurance	16.7	16.2
Fair Value
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Company-owned life insurance	16.7	16.2
Fair Value | Level 2
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Long-term debt	$ 639.8	$ 638.7