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Debt (Details)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2011
$800M Credit Agreement [Member]
USD ($)
Oct. 05, 2011
$800M Credit Agreement [Member]
USD ($)
Oct. 04, 2011
Prior Revolving Credit Facility [Member]
USD ($)
Dec. 31, 2010
Prior Revolving Credit Facility [Member]
USD ($)
Dec. 31, 2011
Uncommitted Credit Lines [Member]
USD ($)
Dec. 31, 2011
Euro 300 Due June 2012 [Member]
USD ($)
Dec. 31, 2011
Euro 300 Due June 2012 [Member]
EUR (€)
Dec. 31, 2010
Euro 300 Due June 2012 [Member]
USD ($)
Dec. 31, 2011
Euro 200 Due June 2013 [Member]
USD ($)
Dec. 31, 2011
Euro 200 Due June 2013 [Member]
EUR (€)
Dec. 31, 2010
Euro 200 Due June 2013 [Member]
USD ($)
Dec. 31, 2011
Other Debt [Member]
USD ($)
Dec. 31, 2010
Other Debt [Member]
USD ($)
Short-Term Debt [Abstract]                              
Short-term borrowings $ 42.4 $ 28.0                          
Weighted-average interest rates 11.90% 7.00%                          
Debt Instrument [Line Items]                              
Long-term debt 657.8 670.0           388.7   401.2 258.9   267.1 10.2 1.7
Less: current maturities 391.8 0.7                          
Long-term debt 266.0 669.3                          
Maturity date               Jun. 01, 2012 Jun. 01, 2012   Jun. 14, 2013 Jun. 14, 2013      
Principal amount (Euros in millions)                 300.0     200.0      
Interest rate (in hundredths)               4.50% 4.50%   4.75% 4.75%      
Discounted issue price (in hundredths)               99.518% 99.518%   99.349% 99.349%      
Effective interest rate (in hundredths)               4.58% 4.58%   4.862% 4.862%      
Unamortized discount               1.8 1.4   1.6 1.3      
Revolving Credit Agreement                              
Uncommitted credit lines, maximum borrowing capacity     800.0 800.0 400.0 400.0 399.2                
Uncommitted credit lines, remaining borrowing capacity     798.4       346.6                
Uncommitted credit lines, current borrowing capacity after limitations             248.7                
Expiration date     2016-10-4                        
Portion which may be used for the issuance of stand-by letters of credit       150.0                      
Outstanding letters of credit     1.6     2.2                  
Covenant terms     The Agreement contains customary restrictive covenants pertaining to our management and operations, including limitations on the amount of subsidiary debt that we may incur and limitations on our ability to pledge assets, as well as financial covenants, including covenants requiring, among other things, that we comply with a leverage ratio (Debt-to-EBITDA) of not greater than 3.5 to 1 and a fixed charge coverage ratio of not less than 1.5 to 1. The Agreement also contains customary events of default, including, among others, payment defaults, material inaccuracy of representations and warranties, covenant defaults, bankruptcy or involuntary proceedings, certain monetary and non-monetary judgments, change of control and customary ERISA defaults. The material terms and conditions of the Agreement are substantially similar to the material terms and conditions of the prior credit facility.                        
Covenant compliance     As defined in the Agreement, we had a Debt-to-EBITDA ratio of 0.80 to 1 (compared to a maximum allowable ratio of 3.5 to 1) as of December 31, 2011 and a Fixed Charge Coverage ratio of 3.13 to 1 (compared to a minimum required ratio of 1.5 to 1) as of December 31, 2011.                        
Facility fee (in hundredths)     0.225%                        
Credit spread (in hundredths)     1.275%                        
Impact of downgrades from credit rating agencies on facility fees from approximately $0.2 to $0.4                            
Debt Maturities [Abstract]                              
2012 261.5                            
2013 1.5                            
2014 1.0                            
2015 $ 2.0