Share-based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Share-based Payment Arrangement [Abstract]
Share-based compensation	$ 17.5	$ 13.9	$ 22.9
Income tax benefit from compensation expense	$ 3.8	$ 3.2	$ 4.9
Number of shares available for grant (in shares)	5.0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned compensation cost	$ 0.0
Granted, weighted average grant date fair value (in dollars per share)	$ 15.98	$ 35.39	$ 58.76
Total fair value of shares vested	$ 0.2	$ 0.4	$ 0.8
Aggregate Intrinsic Value	$ 2.2
Restricted Stock \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned compensation cost	$ 8.9
Granted, weighted average grant date fair value (in dollars per share)	$ 14.33	$ 35.50	$ 52.55
Total fair value of shares vested	$ 2.0	$ 7.9	$ 13.0
Unearned compensation cost, weighted average period of recognition (in years)	1 year 10 months 24 days
Aggregate Intrinsic Value	$ 59.3
Stock Equivalent Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate Intrinsic Value	1.0
Total intrinsic value of stock equivalent units converted to common stock	$ 0.0	$ 0.0	$ 1.7
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Granted, weighted average grant date fair value (in dollars per share)	$ 5.56	$ 8.64	$ 12.26
Unearned compensation cost, weighted average period of recognition (in years)	1 year 10 months 24 days
Award expiration period	10 years
Exercised, total intrinsic value	$ 0.6	$ 0.4	$ 1.7
Unrecognized compensation cost	3.2
Cash received from option exercises	1.8	1.0	4.4
Tax benefit realized from option exercises	$ 0.2	$ 0.1	$ 0.4
Stock Options \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years

Share-based Compensation Arrangement by Shared-based Payment Award, Equity Converted in Period, Total Intrinsic Value

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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