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Indebtedness (Narrative) (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Dec. 31, 2015
EUR (€)
Aug. 31, 2015
USD ($)
Debt Instrument [Line Items]          
Interest Paid $ 63,000,000 $ 68,400,000 $ 66,400,000    
Long-term debt 297,400,000        
Repayments of convertible debt 0 201,200,000 0    
Outstanding letters of credit 17,500,000 18,500,000      
4 1/2% Senior term loan due 2016          
Debt Instrument [Line Items]          
Senior Notes $ 217,200,000 $ 242,000,000   € 200,000,000.0  
Debt Interest Rate 4.50% 4.50%   4.50%  
Line of Credit          
Debt Instrument [Line Items]          
Long-term line of credit $ 338,900,000 $ 404,400,000      
Remaining borrowing capacity   750,600,000      
1.056% Senior Term Loan          
Debt Instrument [Line Items]          
Senior Notes $ 217,200,000 $ 0   € 200,000,000.0  
Unused borrowing capacity | €       € 200,000,000.0  
Debt Interest Rate 1.056% 1.056%   1.056%  
5 7/8% Senior Notes due 2021          
Debt Instrument [Line Items]          
Senior Notes $ 297,400,000 $ 300,000,000      
Debt Interest Rate 5.875% 5.875%   5.875%  
Long-term debt $ 297,400,000 $ 337,600,000      
Debt, weighted average interest rate 4.53%     4.53%  
5 7/8% Senior Notes due 2021 | Interest Accrual, Option Two          
Debt Instrument [Line Items]          
Variable rate 0.50%        
1 1/4percent Convertible Senior Subordinated Notes Due December 15, 2036          
Debt Instrument [Line Items]          
Debt Interest Rate 1.25% 1.25%   1.25%  
Debt repurchased   $ 49,700,000      
Convertible notes converted   151,500,000 100,000    
Excess conversion value of the notes   $ 81,000,000 $ 100,000    
Conversion of 1 1/4% convertible senior subordinated notes, shares issued | shares   1,437,465 286    
Repayments of convertible debt   $ 201,200,000      
Amended and Restated Credit Facility Agreement | Line of Credit | Interest Accrual, Option Two          
Debt Instrument [Line Items]          
Variable rate 0.50%        
Amended and Restated Credit Facility Agreement | Line of Credit | Interest Accrual, Option Three          
Debt Instrument [Line Items]          
Variable rate 1.00%        
Amended and Restated Credit Facility Agreement | Line of Credit | Minimum | Interest Accrual, Option One          
Debt Instrument [Line Items]          
Variable rate 1.00%        
Amended and Restated Credit Facility Agreement | Line of Credit | Maximum | Interest Accrual, Option One          
Debt Instrument [Line Items]          
Variable rate 1.75%        
Amended and Restated Credit Facility Agreement | Variable Basis, Additional Margin | Line of Credit | Minimum | Interest Accrual, Option Three          
Debt Instrument [Line Items]          
Variable rate 0.00%        
Amended and Restated Credit Facility Agreement | Variable Basis, Additional Margin | Line of Credit | Maximum | Interest Accrual, Option Three          
Debt Instrument [Line Items]          
Variable rate 0.25%        
Prior Credit Facility Agreement | Line of Credit | Interest Accrual, Option Two          
Debt Instrument [Line Items]          
Variable rate 0.50%        
Prior Credit Facility Agreement | Line of Credit | Interest Accrual, Option Three          
Debt Instrument [Line Items]          
Variable rate 1.00%        
Prior Credit Facility Agreement | Line of Credit | Minimum | Interest Accrual, Option One          
Debt Instrument [Line Items]          
Variable rate 1.00%        
Prior Credit Facility Agreement | Line of Credit | Maximum | Interest Accrual, Option One          
Debt Instrument [Line Items]          
Variable rate 2.00%        
Prior Credit Facility Agreement | Variable Basis, Additional Margin | Line of Credit | Minimum | Interest Accrual, Option Three          
Debt Instrument [Line Items]          
Variable rate 0.00%        
Prior Credit Facility Agreement | Variable Basis, Additional Margin | Line of Credit | Maximum | Interest Accrual, Option Three          
Debt Instrument [Line Items]          
Variable rate 0.50%        
Term Loan Facility | Line of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 338,900,000     € 312,000,000  
Fair value of amount outstanding   355,000,000     $ 355,000,000
Revolving Credit Facility | Line of Credit          
Debt Instrument [Line Items]          
Maximum borrowing capacity 800,000,000        
Fair value of amount outstanding   $ 49,400,000      
Long-term line of credit 0        
Remaining borrowing capacity $ 800,000,000        
Cash Flow Hedging | Interest Rate Swap | Designated as Hedging Instrument          
Debt Instrument [Line Items]          
Derivative, fixed interest rate 0.33%     0.33%