Summary of Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
ERP Systems, Useful Life	10
Leasehold Improvements, Useful Life	the shorter of the useful life or the remaining lease term
Number of Reporting Units for Purposes of Annual Goodwill Impairment Test	12
Foreign Currency Transaction pre-tax (Gain) Loss	$ (2.0)	$ 1.4	$ 0.6
Minimum
Property and Equipment, Useful Life	3 years
Buildings, Useful Life	10 years
Other Internal Use Software, Useful Life	3
Finite-Lived Intangible Assets, Useful Life	7 years
Maximum
Property and Equipment, Useful Life	7 years
Buildings, Useful Life	35 years
Other Internal Use Software, Useful Life	7
Finite-Lived Intangible Assets, Useful Life	15 years