Employee Benefit Plans (Investments Of The Plan Measured At Fair Value) (Details) (USD $) In Millions	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009
Fair value of the plan investments	$ 1,313.3	$ 981.7	$ 787.0
Comingled Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of the plan investments	529.7	357.1
Comingled Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of the plan investments
Comingled Trusts [Member] | Total [Member]
Fair value of the plan investments	529.7	357.1
U.S. Government Agencies [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of the plan investments	207.4	191.3
U.S. Government Agencies [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of the plan investments
U.S. Government Agencies [Member] | Total [Member]
Fair value of the plan investments	207.4	191.3
Mutual Funds [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair value of the plan investments	283.4	252.1
Mutual Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of the plan investments
Mutual Funds [Member] | Total [Member]
Fair value of the plan investments	283.4	252.1
Corporate And Municipal Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of the plan investments	237.7	160.1
Corporate And Municipal Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of the plan investments
Corporate And Municipal Bonds [Member] | Total [Member]
Fair value of the plan investments	237.7	160.1
Mortgage-Backed Security Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of the plan investments	33.1	0.7
Mortgage-Backed Security Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of the plan investments
Mortgage-Backed Security Bonds [Member] | Total [Member]
Fair value of the plan investments	33.1	0.7
Total Pension Assets Excluding Cash [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair value of the plan investments	283.4	252.1
Total Pension Assets Excluding Cash [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair value of the plan investments	1,007.9	709.2
Total Pension Assets Excluding Cash [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of the plan investments
Total Pension Assets Excluding Cash [Member] | Total [Member]
Fair value of the plan investments	1,291.3	961.3
Cash And Cash Equivalents [Member]
Fair value of the plan investments	$ 22.0	$ 20.4