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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Jun. 30, 2020	Jun. 30, 2019
Supplemental Cash Flow Elements [Abstract]
Cash paid for income taxes	$ 1.8	$ 4.6	$ 1.0	$ 6.5
Cash paid for interest	5.2	4.4	9.5	11.6
Cash received for income tax receivables	0.0	90.0	0.0	0.0
Establishment of operating lease right-of-use assets and lease liabilities
Operating lease right-of-use assets	0.0	41.8	74.5	0.0
Operating lease liabilities	0.0	(48.1)	(78.8)	0.0
Accrued liabilities and other long-term liabilities	$ 0.0	$ 0.0	$ 4.3	$ 0.0

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- Definition

Lease Related Expenditures Incurred But Not Yet Paid

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Operating Lease Liability Established

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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The amount of cash received during the period as refunds for the overpayment of taxes.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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