v3.26.1
Reclassifications from Accumulated Other Comprehensive Loss - Summary of Amounts Reclassified from AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Amount reclassified from AOCI                      
Other (income) expense, net                 $ 7.6 $ (6.1) $ (60.5)
Income before income taxes                 656.2 467.3 211.6
Tax benefit (expense)                 (126.4) (91.3) (25.1)
Net income $ 162.4 $ 139.6 $ 105.3 $ 122.5 $ 111.7 $ 95.4 $ 84.1 $ 84.8 529.8 376.0 $ 186.5
Amount Reclassified from AOCI | Cash flow hedging items                      
Amount reclassified from AOCI                      
Cost of sales                 (2.4) (4.2)  
Income before income taxes                 (2.4) (4.2)  
Tax benefit (expense)                 0.6 1.0  
Net income                 (1.8) (3.2)  
Amount Reclassified from AOCI | Pension and other postretirement benefit plan items                      
Amount reclassified from AOCI                      
Income before income taxes                 (2.7) (5.0)  
Tax benefit (expense)                 0.6 1.2  
Net income                 (2.1) (3.8)  
Amount Reclassified from AOCI | Net actuarial loss                      
Amount reclassified from AOCI                      
Other (income) expense, net                 (0.7) (1.7)  
Amount Reclassified from AOCI | Prior service cost                      
Amount reclassified from AOCI                      
Other (income) expense, net                 (1.7) (3.3)  
Amount Reclassified from AOCI | Settlement charge                      
Amount reclassified from AOCI                      
Other (income) expense, net                 $ (0.3) $ 0.0