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Reclassifications from Accumulated Other Comprehensive Loss - Schedule of Changes in AOCI by Component, Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balances at the beginning of the period $ 1,473.8 $ 1,321.1 $ 1,396.1 $ 1,330.5
Other comprehensive (loss) income before reclassifications (16.3) (7.8) (19.8) 2.9
Amounts reclassified from AOCI 43.4 0.3 47.5 (3.5)
Total other comprehensive income (loss), net of tax 27.1 (7.5) 27.7 (0.6)
Balances at the end of the period 1,502.6 1,327.2 1,502.6 1,327.2
AOCI Attributable to Parent        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balances at the beginning of the period (142.4) (166.6) (143.0) (173.5)
Balances at the end of the period (115.3) (174.1) (115.3) (174.1)
Cash flow hedging items        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balances at the beginning of the period (10.7) 6.7 (7.0) 5.5
Other comprehensive (loss) income before reclassifications (0.9) (10.1) (7.1) (3.0)
Amounts reclassified from AOCI 3.2 (0.8) 5.7 (6.7)
Total other comprehensive income (loss), net of tax 2.3 (10.9) (1.4) (9.7)
Balances at the end of the period (8.4) (4.2) (8.4) (4.2)
Pension and other postretirement benefit plan items        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balances at the beginning of the period (93.9) (130.8) (95.5) (132.9)
Other comprehensive (loss) income before reclassifications (13.2) 0.0 (13.2) 0.0
Amounts reclassified from AOCI 40.2 1.1 41.8 3.2
Total other comprehensive income (loss), net of tax 27.0 1.1 28.6 3.2
Balances at the end of the period (66.9) (129.7) (66.9) (129.7)
Foreign currency items        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balances at the beginning of the period (37.8) (42.5) (40.5) (46.1)
Other comprehensive (loss) income before reclassifications (2.2) 2.3 0.5 5.9
Amounts reclassified from AOCI 0.0 0.0 0.0 0.0
Total other comprehensive income (loss), net of tax (2.2) 2.3 0.5 5.9
Balances at the end of the period $ (40.0) $ (40.2) $ (40.0) $ (40.2)