Changes in Accumulated Other Comprehensive Income/(Loss) by Component - Schedule of Changes in Accumulated Balances for Each Component of Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 2,112.7	$ 1,903.7	$ 2,240.6	$ 1,919.1
Other comprehensive income/(loss) before reclassifications	(49.3)	(112.0)	(65.8)	(135.1)
Amounts reclassified from accumulated other comprehensive income/(loss)	0.3	0.2	0.5	0.5
Ending balance	2,067.6	1,786.6	2,067.6	1,786.6
Foreign Currency Translation
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(290.1)	(237.2)	(273.6)	(214.1)
Other comprehensive income/(loss) before reclassifications	(49.3)	(112.0)	(65.8)	(135.1)
Amounts reclassified from accumulated other comprehensive income/(loss)	0.0	0.0	0.0	0.0
Ending balance	(339.4)	(349.2)	(339.4)	(349.2)
Pension and Post- Retirement Liabilities
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(4.6)	(4.8)	(4.6)	(4.8)
Other comprehensive income/(loss) before reclassifications	0.0	0.0	0.0	0.0
Amounts reclassified from accumulated other comprehensive income/(loss)	0.1	0.0	0.1	0.0
Ending balance	(4.5)	(4.8)	(4.5)	(4.8)
Cash Flow Hedge
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(6.3)	(7.2)	(6.5)	(7.4)
Other comprehensive income/(loss) before reclassifications	0.0	0.0	0.0	0.0
Amounts reclassified from accumulated other comprehensive income/(loss)	0.2	0.2	0.4	0.4
Ending balance	(6.1)	(6.9)	(6.1)	(6.9)
Accumulated Other Comprehensive Income (Loss)
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(301.0)	(249.2)	(284.7)	(226.3)
Ending balance	$ (350.0)	$ (361.0)	$ (350.0)	$ (361.0)