PENSION PLANS (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 14.9	$ 2.2
After-tax charge to shareholders' equity	145.5	76.5
Pretax charge to shareholders' equity	$ 177.7	$ 100.6	$ 26.9
Basis point increase (decrease) in the plans' discount rate reflected in (benefit) charge to shareholders' equity	(100)	60
Actuarial loss (gain)	$ 364.1	$ (161.7)
Benefit obligation	2,997.8	2,667.8	2,883.3
Projected benefit payments [Abstract]
Par outstanding value of bonds used to determine the discount rate yield curve	$ 250.0
Historic rate of return on plan assets in the last 5 year period (in hundredths)	7.30%
Historic rate of return on plan assets in the last 10 year period (in hundredths)	8.80%
Historic rate of return on plan assets in the last 15 year period (in hundredths)	9.30%
Qualified plans
Projected benefit payments [Abstract]
2020	$ 146.9
2021	146.4
2022	146.3
2023	145.0
2024	143.8
Non-qualified plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	5.8	5.9
Projected benefit payments [Abstract]
2020	0.8
2021	0.5
2022	0.4
2023	0.4
2024	0.2
U.S.
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	0.0
U.S. | Qualified plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	12.5
Foreign | Qualified plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 2.4	2.6	$ 1.7
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		$ 5.0