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Income Taxes - (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
U.S. federal statutory tax rate (as a percent)						21.00%	35.00%
Effective income tax rate (as a percent)	26.00%	18.10%		24.20%	210.00%
Effective income tax rate excluding certain discrete tax items (as a percent)	28.60%	28.20%		28.40%	28.20%
Tax Cuts and Jobs Act of 2017, provisional net charge			$ 56.0
ASU 2016-09
Excess tax benefits from employee stock compensation benefit	$ 0.7			$ 2.6

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- 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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Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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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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