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Summary of Significant Accounting Policies (Deferred Softward Costs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred software costs $ 18.4 $ 15.4  
Capitalized Computer Software, Amortization $ 6.0 $ 4.0 $ 1.3
Maximum | Software Development [Member]      
Useful lives 36 months    
Maximum | Software and Software Development Costs [Member]      
Useful lives 5 years