POSTRETIREMENT BENEFIT PLANS (Tables)

9 Months Ended

Sep. 30, 2017

Compensation and Retirement Disclosure [Abstract]

Net Periodic Benefit Cost of Pension Plans and Other Employee Related Benefit Plans

The following tables provide the components of net periodic benefit cost for pension plans and other employee-related benefit plans for the three and nine months ended September 30, 2017 and 2016.

	2017												2016
For the Three Months Ended September 30	Pension				Other Benefits				Total				Pension				Other Benefits				Total
Service cost		$	1.5			$	0.2			$	1.7			$	1.5			$	0.2			$	1.7
Interest cost		3.0				1.1				4.1				3.3				1.2				4.5
Expected return on plan assets		(4.6		)		(0.1		)		(4.7		)		(5.0		)		(0.1		)		(5.1		)
Amortization of prior service cost (benefit)		0.2				(1.4		)		(1.2		)		0.2				(1.6		)		(1.4		)
Amortization of net actuarial loss		2.1				1.1				3.2				2.0				1.2				3.2
Net periodic benefit cost		2.2				0.9				3.1				2.0				0.9				2.9
Loss from curtailment		3.7				—				3.7				—				—				—
Total net periodic benefit cost		$	5.9			$	0.9			$	6.8			$	2.0			$	0.9			$	2.9
	2017												2016
For the Nine Months Ended September 30	Pension				Other Benefits				Total				Pension				Other Benefits				Total
Service cost		$	4.3			$	0.6			$	4.9			$	4.0			$	0.6			$	4.6
Interest cost		9.0				3.4				12.4				10.2				3.6				13.8
Expected return on plan assets		(13.7		)		(0.3		)		(14.0		)		(15.1		)		(0.4		)		(15.5		)
Amortization of prior service cost (benefit)		0.7				(4.3		)		(3.6		)		0.7				(4.9		)		(4.2		)
Amortization of net actuarial loss		5.6				3.2				8.8				5.7				3.6				9.3
Net periodic benefit cost		5.9				2.6				8.5				5.5				2.5				8.0
Loss from curtailment		3.7				—				3.7				—				—				—
Total net periodic benefit cost		$	9.6			$	2.6			$	12.2			$	5.5			$	2.5			$	8.0