Pension Plans and Other Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2020

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, 2020			December 31, 2019
Overfunded defined benefit pension plans	$	9.5		$	8.5
Underfunded defined benefit pension plans	(83.1		)	(85.2		)
Unfunded defined benefit pension plans	(449.4		)	(434.6		)
Total underfunded and unfunded defined benefit pension plans	(532.5		)	(519.8		)
Pension liabilities included in other current liabilities	(15.1		)	(14.8		)
Net funded status	$	(538.1	)	$	(526.1	)

Components of net periodic benefit cost (income)

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

	Three Months Ended September 30,
	2020						2019
(In millions)	U.S.			Non-U.S.			U.S.			Non-U.S.
Service cost	$	4.8		$	2.8		$	3.9		$	2.2
Interest cost	7.5			1.1			9.6			1.4
Expected return on plan assets	(12.1		)	(0.3		)	(12.1		)	(0.3		)
Amortization of prior service credit	(0.2		)	—			(0.2		)	—
Net periodic benefit cost (income)	$	—		$	3.6		$	1.2		$	3.3

	Nine Months Ended September 30,
	2020						2019
(In millions)	U.S.			Non-U.S.			U.S.			Non-U.S.
Service cost	$	14.2		$	8.2		$	11.8		$	6.5
Interest cost	22.6			3.1			28.7			4.1
Expected return on plan assets	(36.2		)	(0.8		)	(36.2		)	(0.7		)
Amortization of prior service credit	(0.5		)	—			(0.5		)	—
Net periodic benefit cost (income)	$	0.1		$	10.5		$	3.8		$	9.9