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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Taxes [Line Items]    
Provision for income taxes $ 5.8 $ 7.4
Number of years federal income tax returns are subject to examination 3 years  
Period in which significant changes in unrecognized tax benefits are not expected next twelve months  
U.S. Federal    
Income Taxes [Line Items]    
Income tax examination, start year 2013  
Income tax examination, end year 2016  
State and Local    
Income Taxes [Line Items]    
Income tax examination, start year 2012  
Income tax examination, end year 2016  
Foreign    
Income Taxes [Line Items]    
Income tax examination, start year 2009  
Income tax examination, end year 2016