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Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Annual effective tax rate	16.50%	41.10%
Unrecognized tax benefits	$ 11.6		$ 10.7
Accrued interest and penalties	$ 1.7		$ 1.4

X

- Definition

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

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X

- Definition

Amount of unrecognized tax benefits.

+ References

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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