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Segment Information - Financial Information by Segment (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2013
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information, Operating Income (Loss) [Abstract]                        
Revenue   $ 1,233.0 $ 1,240.0 $ 1,214.0 $ 1,142.0 $ 1,060.0 $ 1,081.0 $ 1,175.0 $ 1,127.0 $ 4,829.0 $ 4,443.0 $ 4,204.0
Total Expense                   2,831.0 2,575.0 2,383.0
Operating income   $ 504.0 $ 549.0 $ 483.0 $ 462.0 376.0 $ 467.0 $ 534.0 $ 491.0 1,998.0 1,868.0 1,821.0
Restructuring           $ 49.0       60.0 49.0 0.0
Depreciation and amortization                   200.0 192.0 158.0
Acquisition-Related Expenses                   3.0 8.0 23.0
Loss pursuant to the divestiture of MAKS                   14.0 0.0 0.0
Captive insurance company settlement $ 15.5                 16.0 0.0  
Adjusted Operating Income                   2,291.0 2,117.0 2,002.0
Eliminations                        
Segment Reporting Information, Operating Income (Loss) [Abstract]                        
Revenue                   (143.0) (136.0) (128.0)
Total Expense                   (143.0) (136.0) (128.0)
Operating income                   0.0 0.0 0.0
Restructuring                   0.0 0.0  
Depreciation and amortization                   0.0 0.0 0.0
Acquisition-Related Expenses                   0.0 0.0 0.0
Loss pursuant to the divestiture of MAKS                   0.0 0.0  
Captive insurance company settlement                   0.0 0.0  
Adjusted Operating Income                   0.0 0.0 0.0
MIS                        
Segment Reporting Information, Operating Income (Loss) [Abstract]                        
Revenue                   2,875.0 2,712.0 2,774.0
MIS | Operating Segments                        
Segment Reporting Information, Operating Income (Loss) [Abstract]                        
Revenue                   3,009.0 2,836.0 2,886.0
Total Expense                   1,376.0 1,276.0 1,314.0
Operating income                   1,633.0 1,560.0 1,572.0
Restructuring                   31.0 32.0  
Depreciation and amortization                   71.0 65.0 74.0
Acquisition-Related Expenses                   0.0 0.0 0.0
Loss pursuant to the divestiture of MAKS                   0.0 0.0  
Captive insurance company settlement                   10.0 0.0  
Adjusted Operating Income                   1,745.0 1,657.0 1,646.0
MA                        
Segment Reporting Information, Operating Income (Loss) [Abstract]                        
Revenue                   1,954.0 1,731.0 1,430.0
MA | Operating Segments                        
Segment Reporting Information, Operating Income (Loss) [Abstract]                        
Revenue                   1,963.0 1,743.0 1,446.0
Total Expense                   1,598.0 1,435.0 1,197.0
Operating income                   365.0 308.0 249.0
Restructuring                   29.0 17.0  
Depreciation and amortization                   129.0 127.0 84.0
Acquisition-Related Expenses                   3.0 8.0 23.0
Loss pursuant to the divestiture of MAKS                   14.0 0.0  
Captive insurance company settlement                   6.0 0.0  
Adjusted Operating Income                   $ 546.0 $ 460.0 $ 356.0