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Activity in Goodwill (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Goodwill [Line Items]    
Beginning balance, Goodwill gross $ 1,035.8 $ 988.5
Additions/adjustments, gross 2,639.7 61.0
Goodwill derecognized upon sale of subsidiary gross   (3.2)
Foreign currency translation adjustments, gross 58.8 (10.5)
Ending balance, Goodwill gross 3,734.3 1,035.8
Beginning balance, Impairment Loss (12.2) (12.2)
Ending balance, Impairment Loss (12.2) (12.2)
Beginning balance 1,023.6 976.3
Additions/adjustments 2,639.7 61.0
Goodwill derecognized upon sale of subsidiary   (3.2)
Foreign currency translation adjustments 58.8 (10.5)
Ending balance 3,722.1 1,023.6
Moodys Investors Service [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 10.5 (4.2)
Ending balance, Goodwill gross 287.5 277.0
Beginning balance 277.0 284.4
Goodwill derecognized upon sale of subsidiary   (3.2)
Foreign currency translation adjustments 10.5 (4.2)
Ending balance 287.5 277.0
Moodys Analytics [Member]    
Goodwill [Line Items]    
Beginning balance, Goodwill gross 758.8 704.1
Additions/adjustments, gross 2,639.7 61.0
Foreign currency translation adjustments, gross 48.3 (6.3)
Ending balance, Goodwill gross 3,446.8 758.8
Beginning balance, Impairment Loss (12.2) (12.2)
Ending balance, Impairment Loss (12.2) (12.2)
Beginning balance 746.6 691.9
Additions/adjustments 2,639.7 61.0
Foreign currency translation adjustments 48.3 (6.3)
Ending balance $ 3,434.6 $ 746.6