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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Tax benefit, settlement of uncertain tax positions	$ 2.7	$ 1.3
Income Tax Contingency [Line Items]
Total excess tax benefits	$ 2.8	$ 1.9
Federal
Income Tax Contingency [Line Items]
Earliest year remaining open for audit and/or settlement in major taxing jurisdictions	2015
State | Minimum
Income Tax Contingency [Line Items]
Earliest year remaining open for audit and/or settlement in major taxing jurisdictions	2013
State | Maximum
Income Tax Contingency [Line Items]
Earliest year remaining open for audit and/or settlement in major taxing jurisdictions	2016

X

- Definition

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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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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 income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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-Topic 740
-SubTopic 10
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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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