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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Unrecognized Tax Benefits
Unrecognized tax benefits at the beginning of period	$ 23.5	$ 21.7	$ 24.9	$ 25.2
Gross increases - current year tax positions	13.9	1.6	2.2	0.6
Gross increases - prior year tax positions	1.0	0.7	0.5	2.4
Gross increases - acquisitions	0.0	0.0	2.3	0.0
Gross decreases - prior year tax positions	(0.1)	0.0	(0.1)	(3.3)
Gross decreases - settlements	0.0	0.0	(2.7)	0.0
Gross decreases - statute lapse	(0.7)	(0.5)	(5.4)	0.0
Unrecognized tax benefits at end of year	37.6	23.5	21.7	24.9
Interest and penalties in year-end balance	$ 2.2	$ 1.4	$ 0.8	$ 1.5

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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