EMPLOYEE BENEFIT PLANS (Tables)

6 Months Ended

Jun. 30, 2019

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	2019			2018			2019			2018
Components of net periodic benefit cost:
Service cost	$	10.9		$	11.8		$	21.8		$	23.6
Interest cost	2.1			1.4			4.2			2.8
Expected return on plan assets	(2.4		)	(2.1		)	(4.8		)	(4.2		)
Amortization of prior service cost and actuarial loss	—			0.1			0.1			0.2
Net periodic benefit cost	$	10.6		$	11.2		$	21.3		$	22.4

(in millions)	Three Months Ended   June 30,				Six Months Ended   June 30,
Post-Retirement Medical Plan	2019		2018		2019		2018
Components of net periodic benefit cost:
Service cost	$	0.3	$	0.2	$	0.5	$	0.5
Interest cost	0.1		0.3		0.3		0.4
Amortization of prior service cost	0.2		0.1		0.3		0.3
Net periodic benefit cost	$	0.6	$	0.6	$	1.1	$	1.2