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Income Taxes (Narrative) (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
tax_year
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Income Tax Contingency [Line Items]      
Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Income Tax Expense (Benefit), Deferred Tax Revaluation, Provisional $ (26,100,000)    
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability 57,300,000    
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount 17,100,000    
Effective Income Tax Rate Reconciliation, Additional Foreign Withholding Taxes, Amount 12,200,000    
Effective Income Tax Rate Reconciliation, Nondeductible (Expense) Income, Defined Benefit Plans, Amount 14,500,000    
Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Income Tax Expense (Benefit) 50,400,000.0    
Deferred Tax Assets, Net of Valuation Allowance 114,200,000 $ 178,400,000  
Tax benefits from activities during the period 28,900,000 21,400,000 $ 9,400,000
Accrual for China withholding taxes no longer permanently reinvested 12,500,000 9,200,000  
Net excess tax benefits (costs) related to stock plan activity     15,400,000
Unrecognized tax benefits 13,600,000 16,700,000 22,100,000
Unrecognized tax benefits that would impact effective tax rate 8,800,000    
Settlements $ 900,000 900,000 1,500,000
Resolution of tax audits that could reduce unrecognized tax benefits, time period (in years) 12 months    
Expiration dates, time period 20 years    
Maximum operating loss carryforward expiring annually $ 10,000,000    
Undistributed Earnings of Foreign Subsidiaries, Not Permanently Reinvested 835,000,000    
Deferred foreign income tax expense (benefit) 12,200,000 $ 2,300,000 $ 1,400,000
Cumulative undistributed earnings that are indefinitely reinvested 410,300,000    
Resulting incremental taxes $ 26,700,000    
Internal Revenue Service (IRS) [Member]      
Income Tax Contingency [Line Items]      
Number of tax years under audit | tax_year 4    
Canada      
Income Tax Contingency [Line Items]      
Number of tax years under audit | tax_year 8    
Deferred foreign income tax expense (benefit) $ 8,300,000    
China      
Income Tax Contingency [Line Items]      
Deferred foreign income tax expense (benefit) $ 700,000