Employee Retirement Benefit Plans-Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 318.0	$ 295.0
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	295.0	272.0
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23.0	21.0
Fair Value Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	2.0
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14.0	29.0
Equity Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Equity Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14.0	29.0
Equity Securities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Equity Securities [Member] | Fair Value Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	164.0	152.0
Debt Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Debt Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	164.0	152.0
Debt Securities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Debt Securities [Member] | Fair Value Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11.0	9.0
Real Estate [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Real Estate [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11.0	7.0
Real Estate [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Real Estate [Member] | Fair Value Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	2.0
Other Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	129.0	105.0
Other Assets [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Other Assets [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	106.0	84.0
Other Assets [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23.0	21.0
Other Assets [Member] | Fair Value Measured at Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Hedge Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 62.0	$ 31.0