v3.26.1
Reclassifications from Accumulated Other Comprehensive Loss - Summary of Changes in AOCI by Component, Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning $ 1,887.0 $ 1,628.8 $ 1,396.1
Other comprehensive (loss) income before reclassifications 43.6 19.0  
Reclassification to earnings, net of tax 3.9 7.0  
Total other comprehensive income, net of tax 47.5 26.0 49.1
Balance, ending 2,227.6 1,887.0 1,628.8
Accumulated Other Comprehensive (Loss) Income      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning (67.9) (93.9) (143.0)
Balance, ending (20.4) (67.9) (93.9)
Cash flow hedging items      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning (4.2) (5.9) (7.0)
Other comprehensive (loss) income before reclassifications (1.4) (1.5) (7.3)
Reclassification to earnings, net of tax 1.8 3.2 8.4
Total other comprehensive income, net of tax 0.4 1.7  
Balance, ending (3.8) (4.2) (5.9)
Pension and other postretirement benefit plan items      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning (27.4) (44.3)  
Other comprehensive (loss) income before reclassifications 46.6 13.1  
Reclassification to earnings, net of tax 2.1 3.8  
Total other comprehensive income, net of tax 48.7 16.9  
Balance, ending 21.3 (27.4) (44.3)
Foreign currency items      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning (36.3) (43.7)  
Other comprehensive (loss) income before reclassifications (1.6) 7.4  
Reclassification to earnings, net of tax 0.0 0.0  
Total other comprehensive income, net of tax (1.6) 7.4  
Balance, ending $ (37.9) $ (36.3) $ (43.7)