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Debt and Credit Facilities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Total debt outstanding    
Short-term borrowings $ 50.0 $ 34.5
Current portion of long-term debt 1.2 1.9
Total current debt 51.2 36.4
Credit facility amount outstanding 50.0 34.5
Other 2.9 2.8
Long-term debt, less current portion 4,935.6 5,010.9
Total debt 4,986.8 5,047.3
Multicurrency term A facility tranche [Member]
   
Total debt outstanding    
Credit facility amount outstanding 933.8 989.9
Debt Instrument (Textual) [Abstract]    
Unamortized lender fees 18.6 22.7
Multicurrency term B facility tranche [Member]
   
Total debt outstanding    
Credit facility amount outstanding 1,100.7 1,118.8
Debt Instrument (Textual) [Abstract]    
Unamortized discount 24.0 26.5
Unamortized lender fees 18.9 21.3
5.625 % Senior Notes due July 2013 [Member]
   
Total debt outstanding    
Senior notes 400.7 401.0
Debt Instrument (Textual) [Abstract]    
Debt interest rate 5.625% 5.625%
Unamortized discount 0.2 0.3
12% Senior Notes due February 2014 [Member]
   
Total debt outstanding    
Senior notes 154.9 156.3
Debt Instrument (Textual) [Abstract]    
Debt interest rate 12.00% 12.00%
7.875% Senior Notes due June 2017 [Member]
   
Total debt outstanding    
Senior notes 394.0 393.5
Debt Instrument (Textual) [Abstract]    
Debt interest rate 7.875% 7.875%
Unamortized discount 6.0 6.5
8.125% senior notes due 2019 [Member]
   
Total debt outstanding    
Senior notes 750.0 750.0
Debt Instrument (Textual) [Abstract]    
Debt interest rate 8.125% 8.125%
8.375% senior notes due 2021 [Member]
   
Total debt outstanding    
Senior notes 750.0 750.0
Debt Instrument (Textual) [Abstract]    
Debt interest rate 8.375% 8.375%
6.875% Senior Notes due July 2033 [Member]
   
Total debt outstanding    
Senior notes 448.6 448.6
Debt Instrument (Textual) [Abstract]    
Debt interest rate 6.875% 6.875%
Unamortized discount $ 1.4 $ 1.4