Changes in Accumulated Other Comprehensive Income (Loss) by Component - Summary of Components of AOCI (Details) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2021	Jun. 30, 2020		Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		$ 1,346.5	$ 1,127.5		$ 1,094.3
Other comprehensive income (loss) before reclassifications		107.2	(30.7)		(18.7)
Amounts reclassified from accumulated other comprehensive income/(loss)		2.5	1.5		0.9
Balance		1,809.1	1,346.5		1,127.5
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance			0.2	[1]	101.3	[2]
Balance	[1]				0.2
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		(84.7)	(58.3)		(43.2)
Other comprehensive income (loss) before reclassifications		117.6	(26.4)		(15.0)
Amounts reclassified from accumulated other comprehensive income/(loss)		0.0	0.0		0.0
Balance		32.9	(84.7)		(58.3)
Foreign Currency Translation | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance					0.0
Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		0.0	0.0		(0.4)
Other comprehensive income (loss) before reclassifications		0.0	0.0		0.0
Amounts reclassified from accumulated other comprehensive income/(loss)		0.0	0.0		0.0
Balance		0.0	0.0		0.0
Securities | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance					0.4
Pension and Post- Retirement Liabilities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		(15.7)	(12.9)		(8.3)
Other comprehensive income (loss) before reclassifications		(2.1)	(4.2)		(3.6)
Amounts reclassified from accumulated other comprehensive income/(loss)		2.4	1.5		0.9
Balance		(15.4)	(15.7)		(12.9)
Pension and Post- Retirement Liabilities | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance					(1.9)
Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		0.0	0.0		0.0
Other comprehensive income (loss) before reclassifications		(8.3)	0.0		0.0
Amounts reclassified from accumulated other comprehensive income/(loss)		0.1	0.0		0.0
Balance		(8.2)	0.0		0.0
Cash Flow Hedge | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance					0.0
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance		(100.4)	(71.2)		(51.9)
Balance		$ 9.2	(100.4)		(71.2)
AOCI Attributable to Parent | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance			$ 0.0	[1]	(1.5)	[2]
Balance	[1]				$ 0.0

[1] Reflects the adoption of accounting standards as described in Note 2, “Summary of Significant Accounting Policies.”

[2] Primarily reflects the adoption of accounting standards as described in Note 3, “Revenue Recognition.”