Employee Benefit Plans (Investments of the Plan Measured at Fair Value) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 1,800.5	$ 2,306.3	$ 1,988.8
Commingled trusts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	798.2	1,060.2
Commingled trusts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Commingled trusts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	798.2	1,060.2
Commingled trusts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets	350.7	426.2
U.S. government securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
U.S. government securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	350.7	426.2
U.S. government securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	263.6	355.9
Mutual funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	11.0	10.2
Mutual funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	252.6	345.7
Mutual funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Corporate and municipal bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	322.4	417.2
Corporate and municipal bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Corporate and municipal bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	322.4	417.2
Corporate and municipal bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Mortgage-backed security bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	32.8	38.6
Mortgage-backed security bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Mortgage-backed security bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	32.8	38.6
Mortgage-backed security bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Total pension asset investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1,767.7	2,298.1
Total pension asset investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	11.0	10.2
Total pension asset investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1,756.7	2,287.9
Total pension asset investments | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 0.0	$ 0.0