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Stockholders' Equity (Changes in Stockholders Equity) (Details) (USD $)
In Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Balance at December 31, 2010     $ 1,313.8  
Amortization of actuarial losses and prior service costs (credits), net of income tax     4.3  
Net (loss) (21.2) 7.2 (37.8) (2.5)
Comprehensive (loss)     (33.5)  
Common stock issued in exchange for convertible senior notes     41.2  
Restricted and other stock issued, net     3.6  
Balance at June 30, 2011 1,325.1   1,325.1  
Common Stock Par Value $.10 per Share [Member]
        
Balance at December 31, 2010     12.3  
Common stock issued in exchange for convertible senior notes     0.7  
Balance at June 30, 2011 13.0   13.0  
Excess of Capital over Par Value [Member]
        
Balance at December 31, 2010     1,172.8  
Common stock issued in exchange for convertible senior notes     40.5  
Restricted and other stock issued, net     (2.9)  
Balance at June 30, 2011 1,210.4   1,210.4  
Retained Earnings [Member]
        
Balance at December 31, 2010     329.9  
Net (loss)     (37.8)  
Balance at June 30, 2011 292.1   292.1  
Treasury Stock [Member]
        
Balance at December 31, 2010     (57.1)  
Restricted and other stock issued, net     6.5  
Balance at June 30, 2011 (50.6)   (50.6)  
Accumulated Other Comprehensive Income [Member]
        
Balance at December 31, 2010     (144.1)  
Amortization of actuarial losses and prior service costs (credits), net of income tax     4.3  
Balance at June 30, 2011 $ (139.8)   $ (139.8)