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Recently Issued and Adopted Accounting Pronouncements and Regulatory Items (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Accounting Policies [Abstract]
Excess tax benefit recognized	$ 1.0	$ 2.3

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- Definition

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

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- References

No definition available.

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