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Redeemable Non-Controlling Interest (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Changes in Redeemable Non-controlling Interest [Roll Forward]      
Balance at January 1 $ 70.3 $ 68.1 $ 0
Contribution by Dow Jones 0 0 675.0
Distribution to Dow Jones 0 0 (607.5)
Allocation of stokc-based compensation 0 0.1 0
Total comprehensive income attributable to redeemable non-controlling interest 10.5 2.1 0.6
Balance at December 31 $ 80.8 $ 70.3 $ 68.1