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Income Taxes (Narrative) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2012
USD ($)
Income Tax Examination [Line Items]                
Deferred Tax Assets, Valuation Allowance       $ 55.4 $ 51.6      
Income tax expense       16.6 56.7 $ 51.2 $ 24.0  
Income before income tax       $ 78.6 $ 163.5 $ 157.9    
Effective tax rate       21.10% 34.70% 32.40%    
Excess benefit from stock-based compensation       $ (0.9) $ (0.2) $ 2.5    
U.S. statutory rate       21.00%     35.00%  
Amended return expected benefit         1.4 1.1    
Transition toll tax and net benefit or revaluation of deferred tax assets and liabilities             49,700,000  
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       $ 2.9 8.4 3.1    
Deferred Federal Income Tax Expense (Benefit) - Undistributed Earnings of Foreign Subsidiaries       4.6        
Undistributed Earnings of Foreign Subsidiaries Not Permanently Reinvested       328.0        
Undistributed earnings of foreign subsidiaries       219.0        
Unrecognized tax benefits, income tax penalties and interest accrued       26.5        
Unrecognized tax benefits       45.1 50.5 43.7 $ 47.2  
Foreign tax credit carryforwards       23.3 25.2      
Operating loss carryforwards, valuation allowance       88.1        
Minimum                
Income Tax Examination [Line Items]                
Reasonably possible change in unrecognized tax benefit       3.0        
Maximum                
Income Tax Examination [Line Items]                
Reasonably possible change in unrecognized tax benefit       4.0        
State and Local Jurisdiction                
Income Tax Examination [Line Items]                
Operating loss carryforwards       $ 14.9        
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                
Income Tax Examination [Line Items]                
Operating loss carryforwards       $ 430.0        
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%        
Potential penalty rate       150.00%        
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes - Foreign, Amount       $ 5.6        
Income tax examination, interest expense       $ 0.3 $ 0.9 1.1    
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Earliest Tax Year                
Income Tax Examination [Line Items]                
Open tax year       2016        
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 $ 1.2   $ 5.6          
Foreign Tax Authority | Canada Revenue Agency | Earliest Tax Year                
Income Tax Examination [Line Items]                
Open tax year       2016        
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       2019        
Domestic Tax Authority                
Income Tax Examination [Line Items]                
Federal General business credit carryforwards       $ 2.1        
Domestic Tax Authority | Internal Revenue Service (IRS)                
Income Tax Examination [Line Items]                
Tax Cuts and Jobs Act, income tax benefit             (25.7)  
Foreign tax credit carryforwards             $ 14.0  
Domestic Tax Authority | Internal Revenue Service (IRS) | Earliest Tax Year                
Income Tax Examination [Line Items]                
Open tax year       2017        
UNITED STATES | 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       $ 28.4