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Accumulated Comprehensive Loss (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
ACCUMULATED COMPREHENSIVE LOSS [Abstract]      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax $ (7,800,000) $ 7,700,000 $ 22,800,000
Foreign currency translation adjustments, beginning of period (400,000) (8,100,000) (30,900,000)
Pension adjustments, beginning of period (73,200,000) (65,600,000) (63,300,000)
Unrealized gain (loss) on derivative instruments, beginning of period (300,000) (100,000) (1,300,000)
Unreazlied gain (loss) on investments, beginning of period 6,500,000 11,400,000 (400,000)
Other, beginning of period (2,200,000) (2,200,000) (2,200,000)
Accumulated comprehensive loss, net of tax, beginning of period (69,600,000) (64,600,000) (98,100,000)
Pension adjustments, activity (22,800,000) (7,600,000) (2,300,000)
Unrealized gain (loss) on derivative financial instruments, activity 700,000 (200,000) 1,200,000
Unrealized gain (loss) on investments, activity (6,300,000) (4,900,000) 11,800,000
Other, activity (400,000)    
Other comprehensive income (loss), activity (36,600,000) (5,000,000) 33,500,000
Foreign currency translation adjustments, end of period (8,200,000) (400,000) (8,100,000)
Pension adjustments, end of period (96,000,000) (73,200,000) (65,600,000)
Unrealized gain (loss) on derivative instruments, end of period 400,000 (300,000) (100,000)
Unreazlied gain (loss) on investments, end of period 200,000 6,500,000 11,400,000
Other, end of period (2,600,000) (2,200,000) (2,200,000)
Accumulated comprehensive loss, net of tax, end of period (106,200,000) (69,600,000) (64,600,000)
Pension adjustments income tax benefit $ 14,100,000 $ 3,000,000 $ 900,000