Consolidated Balance Sheets (unaudited) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents	$ 150.7	$ 152.8
Restricted cash and cash equivalents	2.6	10.7
Trade accounts receivable, less allowance of $11.4 (2017—$11.7)	279.2	285.2
Inventories	319.0	230.9
Other current assets	94.4	49.0
Total Current Assets	845.9	728.6
Properties and equipment, net of accumulated depreciation and amortization of $1,496.4 (2017—$1,463.4)	984.1	799.1
Goodwill	544.4	402.4
Technology and other intangible assets, net	359.4	255.4
Deferred income taxes	543.6	556.5
Investment in unconsolidated affiliate	144.4	125.9
Other assets	91.5	39.1
Total Assets	3,513.3	2,907.0
Current Liabilities
Debt payable within one year	22.8	20.1
Accounts payable	245.1	210.3
Other current liabilities	265.7	217.8
Total Current Liabilities	533.6	448.2
Debt payable after one year	1,963.7	1,523.8
Underfunded and unfunded defined benefit pension plans	455.5	502.4
Defined Benefit Pension Plan Liabilities Noncurrent Underfunded	63.2	110.5
Defined Benefit Pension Plan Liabilities Noncurrent Unfunded	392.3	391.9
Other liabilities	280.3	169.3
Total Liabilities	3,233.1	2,643.7
Commitments and Contingencies—Note 8
Equity
Common stock issued, par value $0.01; 300,000,000 shares authorized; outstanding: 67,098,411 (2017—67,780,410)	0.7	0.7
Paid-in capital	477.0	474.8
Retained earnings	625.4	573.1
Treasury stock, at cost: shares: 10,358,216 (2017—9,676,217)	(875.7)	(832.1)
Accumulated other comprehensive income (loss)	46.5	39.9
Total W. R. Grace & Co. Shareholders’ Equity	273.9	256.4
Noncontrolling interests	6.3	6.9
Total Equity	280.2	263.3
Total Liabilities and Equity	$ 3,513.3	$ 2,907.0