CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income	$ 319.7	$ 256.6	$ 979.2	$ 701.3
Foreign currency translation:
Foreign currency translation adjustments - Pre Tax	45.4	(12.0)	94.9	(9.4)
Foreign currency translation adjustment - Tax	6.4	2.6	19.5	16.6
Foreign currency translation adjustments - Net of Tax	51.8	(9.4)	114.4	7.2
Cash flow hedges:
Net realized and unrealized gain (loss) on cash flow hedges - Pre Tax	5.2	5.1	10.0	2.5
Net realized and unrealized gain (loss) on cash flow hedges - Tax Amount	(2.0)	(1.9)	(3.8)	(1.0)
Net realized and unrealized gain (loss) on cash flow hedges - Net of Tax	3.2	3.2	6.2	1.5
Reclassification of losses (gains) included in net income - Pre Tax	(4.2)	(1.3)	(11.7)	(0.9)
Reclassification of losses included in net income - Tax Amount	1.6	0.4	4.9	0.3
Reclassification of losses (gains) included in net income- Net of Tax	(2.6)	(0.9)	(6.8)	(0.6)
Available for sale securities:
Net unrealized gains on available for sale securities - Pre Tax	0.5	0.7	1.6	1.9
Net unrealized gains on available for sale securities - Net of Tax	0.5	0.7	1.6	1.9
Reclassification of gains included in net income - Pre Tax	(2.2)		(2.2)
Reclassification of gains included in net income - Net of Tax	(2.2)		(2.2)
Pension and Other Retirement Benefits:
Amortization of actuarial losses and prior service costs included in net income - Pre Tax	2.1	2.4	6.4	7.3
Amortization of actuarial losses and prior service costs included in net income - Tax	(0.8)	(0.9)	(2.5)	(2.8)
Amortization of actuarial losses and prior service costs included in net income - Net of Tax	1.3	1.5	3.9	4.5
Net actuarial losses and prior service costs - Pre Tax			7.9	5.3
Net actuarial losses and prior service costs - Tax			(3.0)	(2.0)
Net actuarial losses and prior service costs - Net of Tax			4.9	3.3
Total other comprehensive income (loss) - Pre Tax	46.8	(5.1)	106.9	6.7
Total other comprehensive income (loss) - Tax	5.2	0.2	15.1	11.1
Total other comprehensive income (loss) - Net of Tax	52.0	(4.9)	122.0	17.8
Comprehensive income	371.7	251.7	1,101.2	719.1
Less: Comprehensive income attributable to noncontrolling interests and redeemable noncontrolling interest	3.1	(14.8)	19.6	(10.0)
Comprehensive income attributable to Moody's	$ 368.6	$ 266.5	$ 1,081.6	$ 729.1