Pension Plans and Other Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2019

Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]

Schedule of net funded status of fully funded, underfunded, and unfunded pension plans

The following table presents the funded status of Grace’s pension plans:

(In millions)	September 30, 2019			December 31, 2018
Overfunded defined benefit pension plans	$	6.4		$	5.7
Underfunded defined benefit pension plans	(68.4		)	(67.1		)
Unfunded defined benefit pension plans	(355.9		)	(366.0		)
Total underfunded and unfunded defined benefit pension plans	(424.3		)	(433.1		)
Pension liabilities included in other current liabilities	(14.3		)	(14.7		)
Net funded status	$	(432.2	)	$	(442.1	)

Components of net periodic benefit cost (income)

The following tables present the components of net periodic benefit cost (income).

	Three Months Ended September 30,
	2019						2018
(In millions)	U.S.			Non-U.S.			U.S.			Non-U.S.
Service cost	$	3.9		$	2.2		$	4.9		$	2.3
Interest cost	9.6			1.4			10.3			1.3
Expected return on plan assets	(12.1		)	(0.3		)	(14.5		)	(0.3		)
Amortization of prior service credit	(0.2		)	—			(0.2		)	—
Net periodic benefit cost (income)	$	1.2		$	3.3		$	0.5		$	3.3

	Nine Months Ended September 30,
	2019						2018
(In millions)	U.S.			Non-U.S.			U.S.			Non-U.S.
Service cost	$	11.8		$	6.5		$	14.6		$	7.2
Interest cost	28.7			4.1			30.9			3.8
Expected return on plan assets	(36.2		)	(0.7		)	(43.6		)	(0.8		)
Amortization of prior service credit	(0.5		)	—			(0.5		)	—
Net periodic benefit cost (income)	$	3.8		$	9.9		$	1.4		$	10.2