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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount         $ 46.0      
Income from continuing operations before income taxes in the U.S. countries       $ (151.6) (115.1) $ 6.3    
Income from continuing operations before income taxes in the non-U.S. countries       $ 1,149.0 (423.8) (200.0)    
Tax Cuts and Jobs Act of 2017, Measurement Period Adjustment, Income Tax Expense (Benefit) $ 11.7              
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit)   $ 16.5            
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)           16.5    
Tax Cuts and Jobs Act of 2017, tax benefit on re-measurement on deferred tax assets and liabilities   38.5            
Tax Cuts and Jobs Act of 2017, transition tax   17.3            
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Liability, Income Tax (Expense) Benefit           20.0    
Tax Cuts and Jobs Act of 2017, tax benefit on valuation allowance           19.3    
Deferred tax assets related to U.S. foreign tax credits 123.6 132.3     123.6 132.3    
Deferred tax assets related to net operating loss carryforwards 148.4 187.1     148.4 187.1    
Net operating loss carryforwards 784.2       $ 784.2      
Operating Loss Carryforwards, Limitations on Use         40.2      
Operating loss carryforwards, Not subject to expiration 449.8       $ 449.8      
Operating loss carryforwards, Subject to expiration 334.4       334.4      
Valuation allowance on NOL carryforwards and FTC 271.8       271.8      
Income Tax Expense (Benefit), Discrete Item           32.2 $ 8.4  
Other discrete income tax expenses         $ 21.0 $ 15.7    
Valuation Allowance, Deferred Tax Asset, Change in Amount             5.5  
Unrecognized Tax Benefits Associated with Liabilities for Unrecognized Tax Benefits             $ 5.3  
Consilidated effective income tax rate excluding discrete items         (24.80%) (96.00%) 20.30%  
Minimum percentage threshold for recognition of tax benefits         50.00%      
Total unrecognized tax benefits 143.0 147.6     $ 143.0 $ 147.6 $ 122.0  
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions With Net Operating Loss Carryforwards         6.5 8.2    
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized 127.4       127.4      
Amount of accrued interest and penalties included in other liabilities 40.5 38.6     40.5 38.6    
Amount of interest and penalties recognized in net tax expense         1.9 4.4 3.8  
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations 5.3 1.1     $ 5.3 1.1 0.6  
Document Period End Date         Dec. 31, 2018      
Aggregate Undistributed Earnings of Subsidiaries to be Continually Reinvested 386.7       $ 386.7      
Other Liabilities [Member]                
Total unrecognized tax benefits $ 136.5 $ 139.4     $ 136.5 $ 139.4    
Minimum [Member]                
Deferred Tax Assets, Foreign, Expiration Date         2022      
Operating loss carryforwards tax credits expiration year         2019      
Maximum [Member]                
Deferred Tax Assets, Foreign, Expiration Date         2028      
Operating loss carryforwards tax credits expiration year         2037      
Other Operating Income (Expense) [Member]                
Income Tax Expense (Benefit), Discrete Item             $ 16.9  
Scenario, Forecast [Member]                
Decline in unrecognized tax benefits during next twelve months               $ 0.5
Accrued interest and penalty assessments related to the decline in unrecognized tax benefits               $ 0.3
Accounting Standards Update 2016-16 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]                
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification     $ 14.1