Income Taxes (Tax Years Remaining) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Write-off of valuation allowance related to U.S. Tax Reform	$ 161.4
Recording of a valuation allowance related to unremitted earnings due to U.S. Tax Reform	66.7
Valuation allowance for other miscellaneous withholding tax items due to U.S. Tax Reform	5.5
Utilization of foreign tax credits due to U.S. tax reform	$ 2.9
Beginning [Member] | Brazil [Member]
Open Tax Years by Major Tax Jurisdiction	2012
Beginning [Member] | MEXICO
Open Tax Years by Major Tax Jurisdiction	2012
Beginning [Member] | PHILIPPINES
Open Tax Years by Major Tax Jurisdiction	2014
Beginning [Member] | Poland [Member]
Open Tax Years by Major Tax Jurisdiction	2012
Beginning [Member] | Russia [Member]
Open Tax Years by Major Tax Jurisdiction	2014
Beginning [Member] | UNITED KINGDOM
Open Tax Years by Major Tax Jurisdiction	2016
Beginning [Member] | UNITED STATES
Open Tax Years by Major Tax Jurisdiction	2016
Ending [Member] | Brazil [Member]
Open Tax Years by Major Tax Jurisdiction	2017
Ending [Member] | MEXICO
Open Tax Years by Major Tax Jurisdiction	2017
Ending [Member] | PHILIPPINES
Open Tax Years by Major Tax Jurisdiction	2017
Ending [Member] | Poland [Member]
Open Tax Years by Major Tax Jurisdiction	2017
Ending [Member] | Russia [Member]
Open Tax Years by Major Tax Jurisdiction	2017
Ending [Member] | UNITED KINGDOM
Open Tax Years by Major Tax Jurisdiction	2017
Ending [Member] | UNITED STATES
Open Tax Years by Major Tax Jurisdiction	2017