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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Stock-Based Compensation (Additional Textual) [Abstract]
Maximum period of achievement of performance goals to earn performance units	3 years
Minimum performance period of individual required to earn performance units	3 years
Stock Option [Member]
Stock-Based Compensation (Textual) [Abstract]
Compensation expense related to stock option		$ 0.1	$ 0.7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		1.2	1.9
Excess Tax Benefit from Share-based Compensation, Financing Activities		1.3
Cash received from the exercise of capital stock option	$ 0.9	4.8	22.2
Share-based Payment Arrangement, Exercise of Option, Tax Benefit		0.5	1.4
Total Intrinsic value of options exercised	0.3	2.4	6.6
Restricted Stock Units - Time Vesting Performance Vesting [Member]
Stock-Based Compensation (Textual) [Abstract]
Compensation expense related to stock option	15.3	$ 21.9	$ 19.4
Unrecognized compensation cost	$ 16.4
Unrecognized compensation costs, weighted average period	1 year 9 months 18 days

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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 cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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