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Fair Value Measurements and Other Financial Instruments (Details 1) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2011
Dec. 31, 2010
Carrying amount and estimated fair values of debt    
Other foreign loans carrying value $ 12.4 $ 26.2
Other foreign loans fair value 12.1 26.0
Other domestic loans 2.2 6.5
Other domestic loans fair value 2.1 6.5
Carrying Amount 1,413.6 1,429.2
Fair Value 1,430.7 1,506.0
5.625 % Senior Notes due July 2013 [Member]
   
Carrying amount and estimated fair values of debt    
Senior notes carrying value 400.7 399.4
Senior notes fair value 418.2 423.1
Fair Value Measurements and Other Financial Instruments (Textuals) [Abstract]    
Debt interest rate 5.625% 5.625%
12% Senior Notes due February 2014 [Member]
   
Carrying amount and estimated fair values of debt    
Senior notes carrying value 156.6 156.0
Senior notes fair value 171.6 196.5
Fair Value Measurements and Other Financial Instruments (Textuals) [Abstract]    
Debt interest rate 12.00% 12.00%
7.875% Senior Notes due June 2017 [Member]
   
Carrying amount and estimated fair values of debt    
Senior notes carrying value 393.1 392.6
Senior notes fair value 429.0 438.8
Fair Value Measurements and Other Financial Instruments (Textuals) [Abstract]    
Debt interest rate 7.875% 7.875%
6.875% Senior Notes due July 2033 [Member]
   
Carrying amount and estimated fair values of debt    
Senior notes carrying value 448.6 448.5
Senior notes fair value $ 397.7 $ 415.1
Fair Value Measurements and Other Financial Instruments (Textuals) [Abstract]    
Debt interest rate 6.875% 6.875%