Recently Adopted Standards and Issued Accounting Standards (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 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