Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate on continuing operations (as a percent)		22.20%	33.30%
Anticipated effective tax rate for beginning of year to date (as a percent)		24.60%
Discrete income tax expense (benefit)	$ 1.3	$ (8.4)	$ 0.3
Decrease in unrecognized tax benefits		4.4
Excess tax benefits related to employee stock compensation		$ 4.6

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

+ References

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-Name Accounting Standards Codification
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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost.

+ References

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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