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Income Taxes - (Details) - USD ($) $ in Millions			3 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018
U.S. Federal income tax rate (as a percent)	21.00%	35.00%
Effective income tax rate (as a percent)			(2.90%)	13.90%
Effective income tax rate excluding certain discrete tax items (as a percent)			27.90%	28.10%
ASU 2016-09
Excess tax benefits from employee stock compensation benefit			$ 6.2	$ 1.5

X

- Definition

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

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The tax effects of employee stock option transactions that are recognized differently for financial reporting and tax purposes, occurring during the period and charged or credited directly to shareholders' equity.

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