RETIREMENT PLANS - Aggregate Benefit Obligations and Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Aggregate projected benefit obligation, accumulated benefit obligation and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets:
Aggregate projected benefit obligation		$ 3,257.6	$ 3,088.0
Accumulated benefit obligation		3,071.6	2,882.5
Fair value of plan assets		2,418.1	2,190.6
U.S. Pension
Net periodic benefit costs
Service cost		67.1	76.5	$ 66.4
Interest cost on benefit obligation		81.5	91.1	90.0
Expected return on plan assets		(143.6)	(132.6)	(128.4)
Recognition of net actuarial (gain) loss		30.7	48.5	23.7
Amortization of prior service cost (benefit)		(6.9)	(6.9)	(6.9)
Settlements/curtailments		0.5	0.7
Total expense		29.3	77.3	44.8
U.S. qualified defined benefit plans
Other Pension Plan Information
Contributions to plan	$ 150.0
International Pension
Net periodic benefit costs
Service cost		27.8	31.8	32.2
Interest cost on benefit obligation		31.9	38.1	49.8
Expected return on plan assets		(52.5)	(55.6)	(54.6)
Recognition of net actuarial (gain) loss		12.8	15.4	7.0
Amortization of prior service cost (benefit)		(0.8)	(0.4)	0.4
Settlements/curtailments		1.8	1.0	(1.3)
Total expense		21.0	30.3	33.5
U.S. Postretirement Health Care
Net periodic benefit costs
Service cost		3.0	3.8	4.3
Interest cost on benefit obligation		7.4	9.6	10.8
Expected return on plan assets		(0.7)	(0.9)	(1.0)
Recognition of net actuarial (gain) loss		(1.6)	(6.2)	(8.2)
Amortization of prior service cost (benefit)		(4.3)	(0.1)	(0.3)
Total expense		$ 3.8	$ 6.2	$ 5.6