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Activity in Goodwill (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Goodwill [Line Items]    
Beginning balance, Goodwill gross $ 1,035.8 $ 988.5
Additions/adjustments, gross 3.6 61.0
Goodwill derecognized upon sale of subsidiary gross   (3.2)
Foreign currency translation adjustments, gross 27.3 (10.5)
Ending balance, Goodwill gross 1,066.7 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 3.6 61.0
Goodwill derecognized upon sale of subsidiary   (3.2)
Foreign currency translation adjustments 27.3 (10.5)
Ending balance 1,054.5 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 9.0 (4.2)
Ending balance, Goodwill gross 286.0 277.0
Beginning balance 277.0 284.4
Goodwill derecognized upon sale of subsidiary   (3.2)
Foreign currency translation adjustments 9.0 (4.2)
Ending balance 286.0 277.0
Moodys Analytics [Member]    
Goodwill [Line Items]    
Beginning balance, Goodwill gross 758.8 704.1
Additions/adjustments, gross 3.6 61.0
Foreign currency translation adjustments, gross 18.3 (6.3)
Ending balance, Goodwill gross 780.7 758.8
Beginning balance, Impairment Loss (12.2) (12.2)
Ending balance, Impairment Loss (12.2) (12.2)
Beginning balance 746.6 691.9
Additions/adjustments 3.6 61.0
Foreign currency translation adjustments 18.3 (6.3)
Ending balance $ 768.5 $ 746.6