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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Defined Benefit Plan Disclosure [Line Items]        
Net income $ 64.5 $ 89.0 $ 201.4 $ 149.3
Other comprehensive income (loss), net of tax:        
Marketable securities adjustment (10.7) 5.5 (17.9) 10.0
Currency translation adjustment (39.1) 1.7 (22.5) 13.9
Total other comprehensive income (loss) (48.1) 8.6 (37.0) 26.8
Comprehensive income 16.4 97.6 164.4 176.1
Defined Benefit Plans [Member]
        
Other comprehensive income (loss), net of tax:        
Benefit plans 1.8 1.5 3.5 3.1
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent 1.8 1.5 3.5 3.1
Postretirement Benefits [Member]
        
Other comprehensive income (loss), net of tax:        
Benefit plans (0.1) (0.1) (0.1) (0.2)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent $ (0.1) $ (0.1) $ (0.1) $ (0.2)