Pension Plans and Other Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 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)	June 30, 2020			December 31, 2019
Overfunded defined benefit pension plans	$	9.2		$	8.5
Underfunded defined benefit pension plans	(84.0		)	(85.2		)
Unfunded defined benefit pension plans	(436.5		)	(434.6		)
Total underfunded and unfunded defined benefit pension plans	(520.5		)	(519.8		)
Pension liabilities included in other current liabilities	(14.9		)	(14.8		)
Net funded status	$	(526.2	)	$	(526.1	)

Components of net periodic benefit cost (income)

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

	Three Months Ended June 30,
	2020						2019
(In millions)	U.S.			Non-U.S.			U.S.			Non-U.S.
Service cost	$	4.7		$	2.7		$	4.0		$	2.1
Interest cost	7.5			1.0			9.5			1.4
Expected return on plan assets	(12.1		)	(0.2		)	(12.1		)	(0.2		)
Amortization of prior service credit	(0.1		)	—			(0.1		)	—
Net periodic benefit cost (income)	$	—		$	3.5		$	1.3		$	3.3

	Six Months Ended June 30,
	2020						2019
(In millions)	U.S.			Non-U.S.			U.S.			Non-U.S.
Service cost	$	9.4		$	5.4		$	7.9		$	4.3
Interest cost	15.1			2.0			19.1			2.7
Expected return on plan assets	(24.1		)	(0.5		)	(24.1		)	(0.4		)
Amortization of prior service credit	(0.3		)	—			(0.3		)	—
Net periodic benefit cost (income)	$	0.1		$	6.9		$	2.6		$	6.6