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Debt - Information about credit facilities and other (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Foreign Line of Credit [Member]
Dec. 31, 2013
2011 Credit Facility [Member]
Dec. 31, 2013
Domestic Line Of Credit [Member]
Dec. 31, 2013
2012 Credit Agreement [Member]
Dec. 31, 2013
2012 Credit Agreement [Member]
Term A Facility [Member]
Dec. 31, 2013
2012 Credit Agreement [Member]
Term A Facility [Member]
Adjusted Libor [Member]
Dec. 31, 2013
2012 Credit Agreement [Member]
Term A Facility [Member]
Base Rate [Member]
May 16, 2013
2012 Credit Agreement [Member]
Term B Facility [Member]
Dec. 31, 2013
2012 Credit Agreement [Member]
Term B Facility [Member]
Dec. 31, 2013
2012 Credit Agreement [Member]
Term B Facility [Member]
Adjusted Libor [Member]
Dec. 31, 2013
2012 Credit Agreement [Member]
Term B Facility [Member]
Adjusted Libor [Member]
Minimum [Member]
Dec. 31, 2013
2012 Credit Agreement [Member]
Term B Facility [Member]
Base Rate [Member]
Dec. 31, 2013
Revolving Credit Facility [Member]
Dec. 31, 2013
Letter of Credit [Member]
Line of Credit Facility [Line Items]                                      
Remaining Lease Term 10 years                                    
Principal borrowing capacity, maximum             $ 770.0 $ 745.0 $ 350.0 $ 550.0       $ 870.0          
Repayments of Lines of Credit                         125.0            
Letter of credit amount outstanding                                   90.0 22.9
Remaining borrowing capacity                                   252.6  
Index rate or LIBOR plus (in hundredths)                     3.00% 2.00%     4.00% 1.00% 3.00%    
Line of Credit Facility, Interest Rate Description           Interest at Base Rate or LIBOR plus applicable margin   Interest at Base Rate or LIBOR plus applicable margin LIBOR plus the applicable margin or Base Rate plus the applicable margin                    
Debt instrument, reduction in applicable margin                   0.75%         3.00% 0.75%      
Domestic Qualified Cash, Maximum Percentage                 100.00%                    
Foreign Qualified Cash Maximum Percentage                 60.00%                    
Domestic and Foreign Qualified Cash, Maximum                 150.0                    
Domestic Qualified Cash                 30.9                    
Foreign Qualified Cash, Maximum                 30.1                    
Initial unused commitment fee (in hundredths)                                   0.50%  
Unused commitment fee (in hundredths)                                   0.375%  
Total net leverage ratio                                   350.00%  
Term of Credit Facility               5 years                      
Deferred financing costs 54.3                                    
Debt Instrument Amortization Period Deferred Financing Costs       5 years 8 years                            
Write-off of deferred financing costs $ 4.7 $ 0 $ 0       $ 4.7                        
Interest rate swap period (in years) 4 years                                    
Equity Interest of Subsidiary Guarantor                 100.00%                    
Equity Voting rights of Subsidiary                 65.00%