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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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- References No definition available. + Details
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