Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income tax expense	$ 10.0	$ 16.9		$ 34.6	$ 35.3
Income tax expense as a percent of pre-tax income (loss)	20.00%	24.90%		22.40%	23.00%
Tax benefit due to changes in prior year tax positions	$ 1.6			$ 1.6	$ 1.8
Tax Cuts and Jobs Act of 2017, tax benefit for transition tax			$ 0.2
Discrete tax charge due to re-measurement of deferred tax assets and liabilities			$ 0.2

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit).

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