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Financing Arrangements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Long-term Debt    
Long-term Debt $ 2,340.2 $ 2,352.3
Capital lease obligations 22.1 22.1
Total 2,362.3 2,374.4
Financing Arrangements (Textual) [Abstract]    
Revolving credit facility term Five  
Borrowings under credit facility 12.7 12.3
Borrowing capacity under global syndicated revolving credit facility 653.3  
Uncommitted domestic working capital facilities 75  
Uncommitted and committed foreign working capital facilities 157.5  
Future minimum lease payments under operating lease 259.3  
Uncommitted and Committed Foreign and Domestic Working Capital Facilities [Member]
   
Line of Credit Facility [Line Items]    
Borrowings outstanding under uncommitted and committed foreign and domestic working capital facilities 6.9 25.0
Letters of credit and bank guarantees outstanding 38.0  
Global Syndicated Revolving Credit Facility [Member]
   
Line of Credit Facility [Line Items]    
Letters of credit and bank guarantees outstanding 34.0 37.0
Working Capital Facilities [Member]
   
Line of Credit Facility [Line Items]    
Letters of credit and bank guarantees outstanding 116.2  
New Facility [Member]
   
Line of Credit Facility [Line Items]    
Global syndicated revolving credit facility 700  
Maturity period of global syndicated revolving credit facility May 2016  
Medium-term notes [Member]
   
Long-term Debt    
Long-term Debt 398.9 398.9
Schedule of Long-term Debt Instruments    
Debt instrument, interest rate, stated percentage rate, range, minimum 6.80%  
Debt instrument, interest rate, stated percentage rate, range, maximum 8.70%  
6.29% senior notes, maturing in 2016 [Member]
   
Long-term Debt    
Long-term Debt 294.0 294.2
Schedule of Long-term Debt Instruments    
Maturity date of senior notes 2016  
Debt instrument, interest rate, stated percentage 6.29%  
6.125% senior notes, maturing in 2019 [Member]
   
Long-term Debt    
Long-term Debt 298.4 298.3
Schedule of Long-term Debt Instruments    
Maturity date of senior notes 2019  
Debt instrument, interest rate, stated percentage 6.125%  
4.875% senior notes, maturing in 2020 [Member]
   
Long-term Debt    
Long-term Debt 299.5 299.4
Schedule of Long-term Debt Instruments    
Maturity date of senior notes 2020  
Debt instrument, interest rate, stated percentage 4.875%  
3.6% senior notes, maturing in 2021 [Member]
   
Long-term Debt    
Long-term Debt 598.9 598.9
Schedule of Long-term Debt Instruments    
Maturity date of senior notes 2021  
Debt instrument, interest rate, stated percentage 3.60%  
6.80% senior notes, maturing in 2036 [Member]
   
Long-term Debt    
Long-term Debt 234.8 234.5
Schedule of Long-term Debt Instruments    
Maturity date of senior notes 2036  
Debt instrument, interest rate, stated percentage 6.80%  
7.0% senior notes, maturing in 2038 [Member]
   
Long-term Debt    
Long-term Debt 199.2 199.2
Schedule of Long-term Debt Instruments    
Maturity date of senior notes 2038  
Debt instrument, interest rate, stated percentage 7.00%  
Notes Payable Other Payables [Member]
   
Long-term Debt    
Long-term Debt $ 16.5 $ 28.9
Schedule of Long-term Debt Instruments    
Maturity date of senior notes 2020  
Debt instrument, interest rate, stated percentage rate, range, minimum 0.30%  
Debt instrument, interest rate, stated percentage rate, range, maximum 4.50%