Pension Plans and Other Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 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)	June 30, 2019			December 31, 2018
Overfunded defined benefit pension plans	$	6.2		$	5.7
Underfunded defined benefit pension plans	(68.1		)	(67.1		)
Unfunded defined benefit pension plans	(365.8		)	(366.0		)
Total underfunded and unfunded defined benefit pension plans	(433.9		)	(433.1		)
Pension liabilities included in other current liabilities	(14.6		)	(14.7		)
Net funded status	$	(442.3	)	$	(442.1	)

Components of net periodic benefit cost (income)

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

	Three Months Ended June 30,
	2019						2018
(In millions)	U.S.			Non-U.S.			U.S.			Non-U.S.
Service cost	$	4.0		$	2.1		$	4.9		$	2.5
Interest cost	9.5			1.4			10.3			1.2
Expected return on plan assets	(12.1		)	(0.2		)	(14.6		)	(0.2		)
Amortization of prior service credit	(0.1		)	—			(0.1		)	—
Net periodic benefit cost (income)	$	1.3		$	3.3		$	0.5		$	3.5

	Six Months Ended June 30,
	2019						2018
(In millions)	U.S.			Non-U.S.			U.S.			Non-U.S.
Service cost	$	7.9		$	4.3		$	9.7		$	4.9
Interest cost	19.1			2.7			20.6			2.5
Expected return on plan assets	(24.1		)	(0.4		)	(29.1		)	(0.5		)
Amortization of prior service credit	(0.3		)	—			(0.3		)	—
Net periodic benefit cost (income)	$	2.6		$	6.6		$	0.9		$	6.9