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Income Taxes Other Tax Disclosure (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]          
Unrecognized Tax Benefits   $ 47.7 $ 28.2 $ 41.6 $ 47.3
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities $ 22.9 1.2 17.3    
Total Payments to Taxing Authority Regarding Transfer Pricing Issues, Including Payments Which Decreased Unrecognized Tax Benefits     28.0    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense   (3.1) (1.5) (3.5)  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   7.5 $ 2.5 $ 6.9 $ 12.2
Unrecognized Tax Benefits that Would Impact Effective Tax Rate   $ 55.2