Pension And Other Postretirement Benefits (Fair Value Of Pension Plan By Assets Category) (Details) (USD $) In Millions	Jun. 30, 2011	Jun. 30, 2010
Fair value of pension plan assets	$ 710.2	$ 631.5
Level 1 [Member]
Fair value of pension plan assets	434.2	318.8
Level 1 [Member] | Government Agency Bonds [Member]
Fair value of pension plan assets	65.6	65.0
Level 1 [Member] | Corporate Bonds [Member]
Fair value of pension plan assets	76.0
Level 1 [Member] | Domestic And International Equities [Member]
Fair value of pension plan assets	252.0	253.8
Level 1 [Member] | Commingled Funds [Member]
Fair value of pension plan assets	40.6
Level 2 [Member]
Fair value of pension plan assets	276.0	312.7
Level 2 [Member] | Corporate Bonds [Member]
Fair value of pension plan assets		63.0
Level 2 [Member] | Mortgage Backed Securities [Member]
Fair value of pension plan assets	17.6	13.5
Level 2 [Member] | Short-Term Investments [Member]
Fair value of pension plan assets	10.5	121.5
Level 2 [Member] | Domestic And International Equities [Member]
Fair value of pension plan assets	0.7	0.9
Level 2 [Member] | Commingled Funds [Member]
Fair value of pension plan assets	246.2	112.7
Level 2 [Member] | Asset Backed Securities And Other [Member]
Fair value of pension plan assets	1.0	1.1
Government Agency Bonds [Member]
Fair value of pension plan assets	65.6	65.0
Corporate Bonds [Member]
Fair value of pension plan assets	76.0	63.0
Mortgage Backed Securities [Member]
Fair value of pension plan assets	17.6	13.5
Short-Term Investments [Member]
Fair value of pension plan assets	10.5	121.5
Domestic And International Equities [Member]
Fair value of pension plan assets	252.7	254.7
Commingled Funds [Member]
Fair value of pension plan assets	286.8	112.7
Asset Backed Securities And Other [Member]
Fair value of pension plan assets	$ 1.0	$ 1.1