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Other Income, Net (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2012
Jun. 30, 2011
Schedule of Components of Other Income          
Dividends and interest       $ 14.1 $ 14.7
Securities transactions, net       0.1 0.1
Total 7.1 7.4   14.2 14.8
Equity in earnings of investee (0.1) (0.1)     (0.2)
Currency transactions, net       0.4 2.4
Insurance recoveries 0.3 0.1   1.4 0.5
Litigation settlement gain 14.7     14.7  
Patent litigation settlement gain     7.5   7.5
Other, net       1.2 0.6
Total $ 22.6 $ 8.8   $ 31.9 $ 25.6