Recently Issued Accounting Pronouncements Recently Issued Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Excess tax benefits	$ 0.6	$ 4.7

Share Based Compensation, Excess Tax Benefit, Amount

No definition available.

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