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Recently Adopted Standards and Issued Accounting Standards (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Restricted cash and cash equivalents, current $ 5.1 $ 5.5 $ 5.5 $ 6.6
Deferred taxes | Share based compensation arrangements        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Unrecognized tax benefits       $ 14.7