Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Jun. 30, 2014
Carrying Value
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Long-term debt, including current portion	$ 607.1	$ 604.3
Carrying Value | Level 2
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Company-owned life insurance	17.0	16.2
Fair Value
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Company-owned life insurance	17.0	16.2
Fair Value | Level 2
Carrying amounts and estimated fair values of financial instruments not recorded at fair value
Long-term debt, including current portion	$ 629.0	$ 638.7