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Equity Equity Incentive Plan - Other (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2017	Mar. 31, 2020	Jun. 30, 2019
Equity Transactions
Fair value of share-based compensation awards granted in period				$ 28.4	$ 15.1
Fair value of share-based compensation awards vested in period				$ 17.2	19.6
2019 SPP
Equity Transactions
Vesting period						3 years
Vesting Performance
Equity Transactions
Number of consecutive days considered for the computation of average closing stock prices							30 days
Equity Incentive Market Based Restricted Stock Awards
Equity Transactions
Vested (in shares)				(6,800)
Granted (in dollars per share)							$ 14.35
Restricted Stock
Equity Transactions
Stock based compensation expense	$ 4.5		$ 2.6	$ 12.9	9.5
Performance shares	1,570,539	1,322,552		1,570,539		1,322,552		1,570,539	1,322,552
Unrecognized compensation								$ 28.0
Weighted average period for recognition of total unrecognized compensation expense related to unvested stock options granted				1 year 8 months 12 days
Nonvested at the beginning of the period (in shares)		1,322,552		1,322,552
Granted (in shares)				1,045,661
Vested (in shares)				(721,665)
Forfeited or canceled (in shares)				(76,009)
Nonvested at the end of the period (in shares)	1,570,539			1,570,539		1,322,552
Nonvested at the beginning of the period (in dollars per share)		$ 17.08		$ 17.08
Granted (in dollars per share)				27.12
Vested (in dollars per share)				16.89
Forfeited or canceled (in dollars per share)				21.46
Nonvested at the end of the period (in dollars per share)	$ 23.64			$ 23.64		$ 17.08
Restricted Stock \| Vesting Performance
Equity Transactions
Performance shares	559,089			559,089				559,089
Granted (in shares)				499,818
Vested (in shares)				(210,467)
Nonvested at the end of the period (in shares)	559,089			559,089
Restricted Stock \| Service based awards
Equity Transactions
Performance shares	1,011,450			1,011,450				1,011,450
Granted (in shares)				545,843
Vested (in shares)				(504,398)
Nonvested at the end of the period (in shares)	1,011,450			1,011,450
Performance Share Units
Equity Transactions
Stock based compensation expense	$ 1.5		1.3	$ 4.6	2.4
Granted (in shares)						2,108,305
Granted (in dollars per share)						$ 8.18
Performance shares	2,378,088	2,372,241		2,378,088		2,372,241		2,378,088	2,372,241
Unrecognized compensation								$ 8.7
Weighted average period for recognition of total unrecognized compensation expense related to unvested stock options granted				1 year 6 months
Nonvested at the beginning of the period (in shares)		2,372,241		2,372,241
Granted (in shares)				14,199
Forfeited or canceled (in shares)				(8,352)
Nonvested at the end of the period (in shares)	2,378,088			2,378,088		2,372,241
Nonvested at the beginning of the period (in dollars per share)		$ 10.61		$ 10.61
Granted (in dollars per share)				28.17
Forfeited or canceled (in dollars per share)				29.93
Nonvested at the end of the period (in dollars per share)	$ 10.65			$ 10.65		$ 10.61
Performance Share Units \| Fiscal Year 2019 LTIP
Equity Transactions
Stock based compensation expense	$ 0.0		0.0	$ 0.0	0.0
Fair value		$ 8.3							$ 8.3
Granted (in shares)		278,135				278,135
Granted (in dollars per share)		$ 29.95				$ 29.95
Performance Shares Tranche #1 \| Fiscal Year 2019 LTIP
Equity Transactions
Earned award vesting percentage		45.00%				45.00%
Performance Shares Tranche #2 \| Fiscal Year 2019 LTIP
Equity Transactions
Earned award vesting percentage		25.00%				25.00%
Performance Shares Tranche #3 \| Fiscal Year 2019 LTIP
Equity Transactions
Earned award vesting percentage		30.00%				30.00%
Deferred Stock Units
Equity Transactions
Stock based compensation expense	$ 0.2		$ 0.1	$ 0.4	$ 0.1
Granted (in shares)	23,844
Unissued at the end of the period (in shares)								42,102
Granted (in dollars per share)	$ 20.13
Senior Executives \| Performance Share Units \| 2019 SPP
Equity Transactions
Market capitalization growth performance period				3 years
Threshold period average price of stock to determine final amount						30 days
Threshold days after release of fiscal year 2021 results to calculate average price of stock						7 days
Senior Executives \| Performance Share Units \| Total stock price growth less than 25% \| 2019 SPP
Equity Transactions
Amount earned as percentage of total value growth						0.00%
Percentage of total stock price growth						25.00%
Annualized percentage of total stock price growth						7.60%
Senior Executives \| Performance Share Units \| Total stock price growth 33% \| 2019 SPP
Equity Transactions
Amount earned as percentage of total value growth						6.00%
Percentage of total stock price growth						33.00%
Annualized percentage of total stock price growth						10.00%
Senior Executives \| Performance Share Units \| Total stock price growth equals or greater than 95% \| 2019 SPP
Equity Transactions
Amount earned as percentage of total value growth						7.50%
Percentage of total stock price growth				95.00%
Annualized percentage of total stock price growth				25.00%
Executive Officers \| Performance Share Units \| Vesting Performance
Equity Transactions
Granted (in shares)				141,524
Granted (in dollars per share)				$ 27.91