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Recently Adopted Accounting Standards (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Excess tax benefit due to adoption of ASU 2016-09, amount	$ 0.0	$ 1.0

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- Definition

Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount

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