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Activity in Goodwill (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Line Items]    
Beginning balance, goodwill gross $ 1,033.3 $ 677.4
Additions/adjustments, gross 8.7 397.8
Foreign currency translation adjustments, gross (53.5) (41.9)
Ending balance, goodwill gross 988.5 1,033.3
Beginning balance, Accumulated impairment charge (12.2) (12.2)
Ending balance, Accumulated impairment charge (12.2) (12.2)
Beginning balance, goodwill net 1,021.1 665.2
Additions/adjustments 8.7 397.8
FX translation (53.5) (41.9)
Ending balance, goodwill net 976.3 1,021.1
MIS [Member]    
Goodwill [Line Items]    
Beginning balance, goodwill gross 298.7 11.4
Additions/adjustments, gross 3.7 296.7
Foreign currency translation adjustments, gross (18.0) (9.4)
Ending balance, goodwill gross 284.4 298.7
Beginning balance, goodwill net 298.7 11.4
Additions/adjustments 3.7 296.7
FX translation (18.0) (9.4)
Ending balance, goodwill net 284.4 298.7
MA [Member]    
Goodwill [Line Items]    
Beginning balance, goodwill gross 734.6 666.0
Additions/adjustments, gross 5.0 101.1
Foreign currency translation adjustments, gross (35.5) (32.5)
Ending balance, goodwill gross 704.1 734.6
Beginning balance, Accumulated impairment charge (12.2) (12.2)
Ending balance, Accumulated impairment charge (12.2) (12.2)
Beginning balance, goodwill net 722.4 653.8
Additions/adjustments 5.0 101.1
FX translation (35.5) (32.5)
Ending balance, goodwill net $ 691.9 $ 722.4