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Pension and Other Postretirement Benefits - Schedule of components of the net periodic pension (income) expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]        
Settlement charge $ 0.0 $ 8.9 $ 0.0 $ 8.9
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 2.1 2.4 6.6 7.2
Interest cost 9.1 9.8 27.3 29.6
Expected return on plan assets (14.9) (14.1) (45.0) (41.9)
Amortization of net loss (gain) 2.1 3.8 6.3 12.4
Amortization of prior service cost (credits) 0.6 0.5 1.8 1.5
Settlement charge 0.0 8.9 0.0 8.9
Net pension (income) expense (1.0) 11.3 (3.0) 17.7
Other Postretirement Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.6 0.7 1.6 2.0
Interest cost 1.8 1.9 5.4 5.8
Expected return on plan assets (2.0) (1.6) (5.9) (4.8)
Amortization of net loss (gain) (0.2) 0.9 (0.6) 2.7
Amortization of prior service cost (credits) (1.0) (1.0) (3.0) (3.1)
Settlement charge 0.0 0.0 0.0 0.0
Net pension (income) expense $ (0.8) $ 0.9 $ (2.5) $ 2.6