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Other Income, Net - Schedule of Components of Other Income (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Securities earnings:        
Dividends and interest     $ 19.7 $ 21.3
Securities transactions, net     0.2 0.2
Total 6.6 7.3 19.9 21.5
Equity in earnings of investees     (0.9) (0.1)
Currency transactions, net     (1.5) (0.5)
Insurance recoveries 2.2 1.2 3.8 2.6
Litigation settlement gain       14.7
Other, net     0.5 1.2
Total $ 8.7 $ 7.6 $ 21.8 $ 39.4