GOODWILL AND OTHER ACQUIRED INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2017

Activity in Goodwill

	Year Ended December 31, 2017
	MIS						MA						Consolidated
	Gross goodwill		Accumulated impairment charge		Net goodwill		Gross goodwill		Accumulated impairment charge		Net goodwill		Gross goodwill		Accumulated impairment charge		Net goodwill
Balance at beginning of year	$	277.0	$	-	$	277.0	$	758.8	$	(12.2)	$	746.6	$	1,035.8	$	(12.2)	$	1,023.6
Additions/adjustments		-		-		-		2,622.6		-		2,622.6		2,622.6		-		2,622.6
Foreign currency translation adjustments		8.2		-		8.2		98.8		-		98.8		107.0		-		107.0
Ending balance	$	285.2	$	-	$	285.2	$	3,480.2	$	(12.2)	$	3,468.0	$	3,765.4	$	(12.2)	$	3,753.2
	Year Ended December 31, 2016
	MIS						MA						Consolidated
	Gross goodwill		Accumulated impairment charge		Net goodwill		Gross goodwill		Accumulated impairment charge		Net goodwill		Gross goodwill		Accumulated impairment charge		Net goodwill
Balance at beginning of year	$	284.4	$	-	$	284.4	$	704.1	$	(12.2)	$	691.9	$	988.5	$	(12.2)	$	976.3
Additions/adjustments		-		-		-		61.0		-		61.0		61.0		-		61.0
Goodwill derecognized upon sale of subsidiary		(3.2)		-		(3.2)		-		-		-		(3.2)		-		(3.2)
Foreign currency translation adjustments		(4.2)		-		(4.2)		(6.3)		-		(6.3)		(10.5)		-		(10.5)
Ending balance	$	277.0	$	-	$	277.0	$	758.8	$	(12.2)	$	746.6	$	1,035.8	$	(12.2)	$	1,023.6

Acquired Intangible Assets

		December 31,
		2017		2016
Customer relationships		$	1,345.1	$	310.1
Accumulated amortization			(159.9)		(124.4)
	Net customer relationships		1,185.2		185.7
Trade secrets			30.2		29.9
Accumulated amortization			(28.1)		(25.6)
	Net trade secrets		2.1		4.3
Software/product technology			358.6		87.7
Accumulated amortization			(78.0)		(54.9)
	Net software/product technology		280.6		32.8
Trade names			161.6		75.3
Accumulated amortization			(26.7)		(19.9)
	Net trade names		134.9		55.4
Other (1)			57.4		43.5
Accumulated amortization			(28.6)		(25.3)
	Net other		28.8		18.2
	Total	$	1,631.6	$	296.4
(1)Other intangible assets primarily consist of databases, covenants not to compete, and acquired ratings methodologies and models.

Amortization Expense Relating to Acquired Intangible Assets

	Year Ended December 31,
	2017		2016		2015
Amortization expense	$	61.4	$	34.2	$	31.9

Estimated Future Amortization Expense for Acquired Intangible Assets Subject to Amortization

Year Ending December 31,
2018	$	101.0
2019		97.0
2020		94.7
2021		94.6
2022		94.1
Thereafter		1,150.2
Total estimated future amortization	$	1,631.6