Houghton Combination (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Business Combination Separately Recognized Transactions [Line Items]
BusinessCombinationSeparatelyRecognizedTransactionsDescription			On April 4, 2017, Quaker entered into a share purchase agreement with Gulf Houghton Lubricants, Ltd. to purchase the entire issued and outstanding share capital of Houghton International, Inc. (“Houghton”) (herein referred to as “the Combination”).  The shares will be bought for aggregate purchase consideration consisting of: (i) $172.5 million in cash; (ii) a number of shares of common stock, $1.00 par value per share, of the Company comprising 24.5% of the common stock outstanding upon the closing of the Combination; and (iii) the Company’s assumption of Houghton’s net indebtedness as of the closing of the Combination, which was approximately $690 million at signing.  At closing, the total aggregate purchase consideration is dependent on the Company’s stock price and the level of Houghton’s indebtedness. The Company secured $1.15 billion in commitments from Bank of America Merrill Lynch and Deutsche Bank to fund the Combination and to provide additional liquidity, and has since replaced these commitments with a syndicated bank agreement (“the New Credit Facility”) with a group of lenders for $1.15 billion.  The New Credit Facility is contingent upon and will not be effective until the closing of the Combination.  During the third quarter of 2018 the Company extended the bank commitment for the New Credit Facility through December 15, 2018.  The New Credit Facility is comprised of a $400.0 million multicurrency revolver, a $600.0 million USD term loan and a $150.0 million EUR equivalent term loan, each with a five-year term from the date the New Credit Facility becomes effective.  The maximum amount available under the New Credit Facility can be increased by $200.0 million at the Company’s option if the lenders agree and the Company satisfies certain conditions.  Borrowings under the New Credit Facility will bear interest at a base rate or LIBOR rate plus a margin.  The Company currently estimates the annual floating rate cost will be in the 3.50% to 3.75% range based on current market interest rates.  The New Credit Facility will be subject to certain financial and other covenants, including covenants that the Company’s consolidated net debt to adjusted EBITDA ratio cannot initially exceed 4.25 to 1 and the Company’s consolidated adjusted EBITDA to interest expense ratio cannot be less than 3.0 to 1.  Both the USD and EUR equivalent term loans will have quarterly principal amortization during their respective five-year terms, with 5% amortization of the principal balance due in years 1 and 2, 7.5% in year 3, and 10% in years 4 and 5, with the remaining principal amounts due at maturity.  Until closing, the Company will incur certain interest costs paid to maintain the bank commitment (“ticking fees”), which began to accrue on September 29, 2017 and bear an interest rate of 0.30% per annum.
Business Combination Transaction-Related Expenses	$ 3.8	$ 9.7	$ 14.4	$ 23.1
Business Combination Liabilities	$ 5.1		$ 5.1		$ 5.5