v2.4.0.6
Debt (Details 1) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary of Loss on Extinguishment of Debt                    
Cash Paid in Loss on Extinguishment of Debt               $ 90.6 $ 30.5 $ 48.3
Non-cash Loss on Extinguishment of Debt               120.2 130.3 85.8
Loss on extinguishment of debt 3.5 6.0 199.5 1.8 (9.1) (19.4) (132.3) 210.8 160.8 134.1
$600.0 million 7.125% senior notes due May 2016 [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Principal Repaid               600.0    
Cash Paid in Loss on Extinguishment of Debt               21.4    
Non-cash Loss on Extinguishment of Debt               61.3    
Loss on extinguishment of debt               82.7    
$99.5 million 9.250% debentures due May 2021 [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Principal Repaid               64.2    
Cash Paid in Loss on Extinguishment of Debt               24.2    
Non-cash Loss on Extinguishment of Debt               3.8    
Loss on extinguishment of debt               28.0    
$360.0 million 7.400% debentures due September 2035 [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Principal Repaid               194.8    
Cash Paid in Loss on Extinguishment of Debt               44.7    
Non-cash Loss on Extinguishment of Debt               49.9    
Loss on extinguishment of debt               94.6    
Amendments to Credit facilities [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Non-cash Loss on Extinguishment of Debt               1.7    
Loss on extinguishment of debt               1.7    
Ineffective portion of Interest rate lock settlements [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Cash Paid in Loss on Extinguishment of Debt               0.3    
Loss on extinguishment of debt               0.3    
Industrial revenue bonds [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Cash Paid in Loss on Extinguishment of Debt                   1.0
Non-cash Loss on Extinguishment of Debt                 28.5 1.4
Loss on extinguishment of debt                 28.5 2.4
$425.0 million 6.125% senior notes due February 2014 [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Principal Repaid                 425.0  
Cash Paid in Loss on Extinguishment of Debt                 8.7  
Non-cash Loss on Extinguishment of Debt                 44.1  
Loss on extinguishment of debt                 52.8  
$600.0 million 7.250% senior notes due March 2015 [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Principal Repaid                 600.0  
Cash Paid in Loss on Extinguishment of Debt                 21.8  
Non-cash Loss on Extinguishment of Debt                 57.5  
Loss on extinguishment of debt                 79.3  
Accounts receivable securitization program [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Principal Repaid                 300.0  
Non-cash Loss on Extinguishment of Debt                 0.2  
Loss on extinguishment of debt                 0.2  
$350.0 million 6.500% senior notes due 2010 [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Principal Repaid                   128.4
Cash Paid in Loss on Extinguishment of Debt                   6.3
Non-cash Loss on Extinguishment of Debt                   3.7
Loss on extinguishment of debt                   10.0
$400.0 million 5.750% senior notes due 2011 [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Principal Repaid                   137.1
Cash Paid in Loss on Extinguishment of Debt                   6.9
Non-cash Loss on Extinguishment of Debt                   6.6
Loss on extinguishment of debt                   13.5
$275.0 million 6.375% senior notes due 2011 [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Principal Repaid                   58.1
Cash Paid in Loss on Extinguishment of Debt                   3.2
Non-cash Loss on Extinguishment of Debt                   2.5
Loss on extinguishment of debt                   5.7
$450.0 million 6.750% senior notes due 2011 [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Principal Repaid                   63.0
Cash Paid in Loss on Extinguishment of Debt                   4.4
Non-cash Loss on Extinguishment of Debt                   0.2
Loss on extinguishment of debt                   4.6
$450.0 million 7.875% senior notes due April 2013 [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Principal Repaid                   450.0
Cash Paid in Loss on Extinguishment of Debt                   11.8
Non-cash Loss on Extinguishment of Debt                   22.6
Loss on extinguishment of debt                   34.4
$400.0 million of 7.375% senior notes due 2014 [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Principal Repaid                   400.0
Cash Paid in Loss on Extinguishment of Debt                   14.7
Non-cash Loss on Extinguishment of Debt                   31.4
Loss on extinguishment of debt                   46.1
$230.0 million of 4.250% senior convertible note due 2034 [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Principal Repaid                   230.0
Non-cash Loss on Extinguishment of Debt                   17.4
Loss on extinguishment of debt                   17.4
Industrial revenue bonds [Member]
                   
Summary of Loss on Extinguishment of Debt                    
Non-cash Loss on Extinguishment of Debt               3.5    
Loss on extinguishment of debt               $ 3.5