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Stock-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Deferred Compensation Arrangement with Individual, Share-based Payments        
Allocated Share-based Compensation Expense $ 6.3 $ 6.1 $ 19.8 $ 15.2