EMPLOYEE BENEFIT PLANS (Tables)

6 Months Ended

Jun. 30, 2020

Defined Benefit Plan [Abstract]

Schedule of net periodic benefit cost

The components of net periodic benefit cost related to the Company’s defined benefit plans consisted of the following:

(in millions)	Three Months Ended June 30,				Six Months Ended June 30,
Pension Benefits	2020		2019		2020		2019
Components of net periodic benefit cost:
Service cost	$	15.1	$	10.9	$	28.9	$	21.8
Interest cost	1.7		2.1		3.5		4.2
Expected return on plan assets	(3.1)		(2.4)		(6.2)		(4.8)
Amortization of prior service cost and actuarial loss	—		—		0.1		0.1
Net periodic benefit cost	$	13.7	$	10.6	$	26.3	$	21.3

(in millions)	Three Months Ended June 30,				Six Months Ended June 30,
Post-Retirement Medical Plan	2020		2019		2020		2019
Components of net periodic benefit cost:
Service cost	$	0.2	$	0.3	$	0.5	$	0.5
Interest cost	0.1		0.1		0.2		0.3
Amortization of prior service cost and actuarial loss	0.2		0.2		0.3		0.3
Net periodic benefit cost	$	0.5	$	0.6	$	1.0	$	1.1