Changes in Accumulated Other Comprehensive Income/(Loss) by Component - Summary of Changes in Accumulated Balances for Each Component of Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 1,346.5	$ 1,127.5
Other comprehensive income/(loss) before reclassifications	37.0	(8.7)
Amounts reclassified from accumulated other comprehensive income/(loss)	0.6	0.4
Balance	1,413.8	1,143.4
Foreign Currency Translation
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Balance	(84.7)	(58.3)
Other comprehensive income/(loss) before reclassifications	37.0	(8.7)
Amounts reclassified from accumulated other comprehensive income/(loss)	0.0	0.0
Balance	(47.7)	(66.9)
Pension and Post- Retirement Liabilities
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Balance	(15.7)	(12.9)
Other comprehensive income/(loss) before reclassifications	0.0	0.0
Amounts reclassified from accumulated other comprehensive income/(loss)	0.6	0.4
Balance	(15.1)	(12.6)
Accumulated Other Comprehensive Income (Loss)
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Balance	(100.4)	(71.2)
Balance	$ (62.9)	$ (79.5)