Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2018

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost

The components of net periodic defined benefit pension cost are presented in the table below.

	Three months ended						Nine months ended
	September 30,						September 30,
	2017			2018			2017			2018
	(In millions)
Service cost	$	3.0		$	2.9		$	8.5		$	8.8
Interest cost		3.6			3.5			10.3			10.7
Expected return on plan assets		(2.6	)		(3.3	)		(7.6	)		(9.9	)
Amortization of prior service cost		-			.1			.2			.2
Recognized actuarial losses		3.5			3.3			10.0			10.3
Total	$	7.5		$	6.5		$	21.4		$	20.1

The components of net periodic postretirement benefits other than pension (“OPEB”) cost are presented in the table below.  

	Three months ended						Nine months ended
	September 30,						September 30,
	2017			2018			2017			2018
	(In millions)
Service cost	$	-		$	-		$	.1		$	.1
Interest cost		.1			.1			.2			.2
Amortization of prior service credit		(.1	)		(.1	)		(.4	)		(.4	)
Recognized actuarial losses		-			.1			.1			.2
Total	$	-		$	.1		$	-		$	.1