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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Statement of Comprehensive Income [Abstract]      
Net income $ 529.8 $ 376.0 $ 186.5
Other comprehensive income (loss), net of tax:      
Net gain on derivative instruments, net of tax of $(0.1), $(0.5) and $(0.3), respectively 0.4 1.7 1.1
Pension and postretirement benefits, net of tax of $(15.0), $(5.3) and $(16.0), respectively 48.7 16.9 51.2
Foreign currency translation (1.6) 7.4 (3.2)
Total other comprehensive income, net of tax 47.5 26.0 49.1
Comprehensive income, net of tax $ 577.3 $ 402.0 $ 235.6