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Activity in Goodwill (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]    
Beginning balance, goodwill gross $ 1,035.8 $ 988.5
Additions/adjustments, gross 2,622.6 61.0
Goodwill derecognized upon sale of subsidiary gross   (3.2)
Foreign currency translation adjustments, gross 107.0 (10.5)
Ending balance, goodwill gross 3,765.4 1,035.8
Beginning balance, Accumulated impairment charge (12.2) (12.2)
Ending balance, Accumulated impairment charge (12.2) (12.2)
Beginning balance, goodwill net 1,023.6 976.3
Additions/adjustments 2,622.6 61.0
Goodwill derecognized   (3.2)
Foreign currency translation adjustments 107.0 (10.5)
Ending balance, goodwill net 3,753.2 1,023.6
MIS [Member]    
Goodwill [Line Items]    
Beginning balance, goodwill gross 277.0 284.4
Goodwill derecognized upon sale of subsidiary gross   (3.2)
Foreign currency translation adjustments, gross 8.2 (4.2)
Ending balance, goodwill gross 285.2 277.0
Beginning balance, goodwill net 277.0 284.4
Goodwill derecognized   (3.2)
Foreign currency translation adjustments 8.2 (4.2)
Ending balance, goodwill net 285.2 277.0
MA [Member]    
Goodwill [Line Items]    
Beginning balance, goodwill gross 758.8 704.1
Additions/adjustments, gross 2,622.6 61.0
Foreign currency translation adjustments, gross 98.8 (6.3)
Ending balance, goodwill gross 3,480.2 758.8
Beginning balance, Accumulated impairment charge (12.2) (12.2)
Ending balance, Accumulated impairment charge (12.2) (12.2)
Beginning balance, goodwill net 746.6 691.9
Additions/adjustments 2,622.6 61.0
Foreign currency translation adjustments 98.8 (6.3)
Ending balance, goodwill net $ 3,468.0 $ 746.6