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Employee Benefit Plans (Stock-Based Compensation Plans) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Unrecognized compensation cost related to nonvested share-based compensation arrangements $ 52.0
Weighted-average period over which unrecognized compensation cost is expected to be recognized 1 year 6 months