EMPLOYEE BENEFIT PLANS (Tables)

6 Months Ended

Jun. 30, 2021

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [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	2021		2020		2021		2020
Components of net periodic benefit cost:
Service cost	$	14.3	$	15.1	$	28.7	$	28.9
Interest cost	1.4		1.7		2.7		3.5
Expected return on plan assets	(3.5)		(3.1)		(7.1)		(6.2)
Amortization of prior service cost and actuarial loss	—		—		—		0.1
Net periodic benefit cost	$	12.2	$	13.7	$	24.3	$	26.3

(in millions)	Three Months Ended June 30,				Six Months Ended June 30,
Post-Retirement Medical Plan	2021		2020		2021		2020
Components of net periodic benefit cost:
Service cost	$	0.1	$	0.2	$	0.5	$	0.5
Interest cost	—		0.1		0.1		0.2
Amortization of prior service cost and actuarial loss	0.2		0.2		0.4		0.3
Net periodic benefit cost	$	0.3	$	0.5	$	1.0	$	1.0