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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2012
Income Tax Examination [Line Items]              
Deferred Tax Assets, Valuation Allowance $ 51.6   $ 51.6 $ 50.8      
Income tax expense     56.7 51.2 $ 26.4    
Income before income tax     $ 163.5 $ 157.9 $ 158.1    
Effective tax rate     34.70% 32.40% 16.70%    
Excess benefit from stock-based compensation     $ (0.2) $ 2.5 $ 5.6    
U.S. statutory rate     21.00% 21.00% 35.00%    
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit)       $ 3.1      
Tax Cuts and Jobs Act, Transition Tax, Income Tax Expense       0.3      
Tax Cuts and Jobs Act, Effect on Executive Compensation, Income Tax Expense       3.3      
Tax Cuts and Jobs Act, Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions, Executive Compensation       1.5      
Tax Cuts and Jobs Act, Impairment of Deferred Tax Assets, Executive Compensation, Income Tax Expense       1.8      
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset - Pension, Income Tax Benefit       0.5      
Additions for tax positions of prior years     $ 8.4 3.1 $ 2.9    
Deferred Federal Income Tax Expense (Benefit) - Undistributed Earnings of Foreign Subsidiaries     2.0        
Undistributed Earnings of Foreign Subsidiaries Not Permanently Reinvested 331.0   331.0        
Undistributed earnings of foreign subsidiaries 177.0   177.0        
Unrecognized tax benefits, income tax penalties and interest accrued 30.1   30.1        
Unrecognized tax benefits 50.5   50.5 43.7 47.2 $ 43.7  
Foreign tax credit carryforwards 25.2   $ 25.2 25.2      
State and Local Jurisdiction | Minimum              
Income Tax Examination [Line Items]              
Statutes of limitation, period     2 years        
State and Local Jurisdiction | Maximum              
Income Tax Examination [Line Items]              
Statutes of limitation, period     5 years        
Foreign Tax Authority | Minimum              
Income Tax Examination [Line Items]              
Statutes of limitation, period     2 years        
Foreign Tax Authority | Maximum              
Income Tax Examination [Line Items]              
Statutes of limitation, period     5 years        
Foreign Tax Authority | Australian Taxation Office | Earliest Tax Year              
Income Tax Examination [Line Items]              
Open tax year     2015        
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil              
Income Tax Examination [Line Items]              
Income tax expense $ 1.6            
Penalty rate 75.00%   75.00%        
Potential penalty rate 150.00%   150.00%        
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes - Foreign, Amount     $ 5.6        
Income tax examination, interest expense     $ 0.9 1.1 2.2    
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Earliest Tax Year              
Income Tax Examination [Line Items]              
Open tax year     2014        
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Years 2007-2012              
Income Tax Examination [Line Items]              
Unrecognized tax benefits             $ 44.5
Potential tax assessment, accrued reserve related to fair value of liabilities acquired             $ 43.3
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2008 to 2010              
Income Tax Examination [Line Items]              
Additions for tax positions of prior years   $ 5.6          
Foreign Tax Authority | Canada Revenue Agency | Earliest Tax Year              
Income Tax Examination [Line Items]              
Open tax year     2015        
Foreign Tax Authority | Federal Ministry of Finance, Germany | Earliest Tax Year              
Income Tax Examination [Line Items]              
Open tax year     2015        
Foreign Tax Authority | Swedish Tax Agency (Skatteverket) | Earliest Tax Year              
Income Tax Examination [Line Items]              
Open tax year     2015        
Foreign Tax Authority | Her Majesty's Revenue and Customs (HMRC) | Earliest Tax Year              
Income Tax Examination [Line Items]              
Open tax year     2018        
Domestic Tax Authority | Internal Revenue Service (IRS)              
Income Tax Examination [Line Items]              
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit)         (25.7)    
Transition Toll Tax - net         24.0    
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax Benefit         49.7    
Foreign tax credit carryforwards         $ 14.0    
Domestic Tax Authority | Internal Revenue Service (IRS) | Earliest Tax Year              
Income Tax Examination [Line Items]              
Open tax year     2016        
U.S. | Pension              
Income Tax Examination [Line Items]              
Defined Benefit Plan Contributions By Employer, Additional Tax Deductible Contribution       $ 4.1      
Other Noncurrent Liabilities | Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2007 to 2010 [Member]              
Income Tax Examination [Line Items]              
Unrecognized tax benefits $ 34.8   $ 34.8