Pension And Other Postretirement Benefits (Fair Value Of Other Postretirement Benefit Plans By Asset Category) (Details) (USD $) In Millions	Jun. 30, 2011	Jun. 30, 2010
Fair values of other postretirement benefit plans	$ 80.3	$ 28.3
Level 1 [Member]
Fair values of other postretirement benefit plans	21.9	23.6
Level 1 [Member] | Government Agency Bonds [Member]
Fair values of other postretirement benefit plans	16.0
Level 1 [Member] | Corporate Bonds And Other [Member]
Fair values of other postretirement benefit plans	5.9
Level 1 [Member] | Domestic And International Equities [Member]
Fair values of other postretirement benefit plans		23.6
Level 2 [Member]
Fair values of other postretirement benefit plans	58.4	4.7
Level 2 [Member] | Short-Term Investments [Member]
Fair values of other postretirement benefit plans	14.5	4.3
Level 2 [Member] | Domestic And International Equities [Member]
Fair values of other postretirement benefit plans		0.4
Level 2 [Member] | Commingled Funds [Member]
Fair values of other postretirement benefit plans	43.9	34.9
Government Agency Bonds [Member]
Fair values of other postretirement benefit plans	16.0
Corporate Bonds And Other [Member]
Fair values of other postretirement benefit plans	5.9
Short-Term Investments [Member]
Fair values of other postretirement benefit plans	14.5	4.3
Domestic And International Equities [Member]
Fair values of other postretirement benefit plans		24.0
Commingled Funds [Member]
Fair values of other postretirement benefit plans	$ 43.9	$ 34.9