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Pension Plans and Other Postretirement Benefits Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Plans, as well as Summary of Significant Assumptions for Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
U.S. Pension Plans |  |  |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |
Benefit obligation, beginning balance |  | $ 729,652 |  | $ 629,337 |  |
Service cost |  | 1,233 |  | 7,029 |  | $ 12,177
Interest cost |  | 31,231 |  | 30,491 |  | 28,406
Plan amendments |  | 0 |  | 0 |  |
Actuarial (gain) loss |  | (55,851) |  | 130,887 |  |
Benefits paid |  | (38,300) |  | (37,866) |  |
Acquisitions |  | 39,125 |  | 0 |  |
Divestitures | [1] | 0 |  | (30,226) |  |
Reclass to liabilities held for sale |  | 0 |  | 0 |  |
Employee contributions |  | 0 |  | 0 |  |
Foreign exchange gain |  | 0 |  | 0 |  |
Settlements/curtailments |  | 0 |  | 0 |  |
Other |  | 0 |  | 0 |  |
Benefit obligation, ending balance |  | 707,090 |  | 729,652 |  | 629,337
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning balance |  | 598,250 |  | 605,604 |  |
Actual return on plan assets |  | (16,789) |  | 53,696 |  |
Employer contributions |  | 1,606 |  | 7,042 |  |
Benefits paid |  | (38,300) |  | (37,866) |  |
Acquisitions |  | 29,314 |  | 0 |  |
Divestitures | [1] | 0 |  | (30,226) |  |
Employee contributions |  | 0 |  | 0 |  |
Foreign exchange loss |  | 0 |  | 0 |  |
Settlements/curtailments |  | 0 |  | 0 |  |
Other |  | 0 |  | 0 |  |
Fair value of plan assets, Ending Balance |  | 574,081 |  | 598,250 |  | 605,604
Funded status |  | (133,009) |  | (131,402) |  |
Current liabilities (accrued expenses) |  | (1,110) |  | (3,219) |  |
Noncurrent liabilities (pension benefits) |  | (131,899) |  | (128,183) |  |
Net pension liability |  | (133,009) |  | (131,402) |  |
Prior service benefit |  | (211) |  | (286) |  |
Net amount recognized |  | $ (211) |  | $ (286) |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |  |  |
Discount Rate |  | 4.67% |  | 4.19% |  |
Rate of compensation increase |  | 0.00% |  | 0.00% |  |
Foreign Pension Plans |  |  |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |
Benefit obligation, beginning balance |  | $ 53,112 |  | $ 49,245 |  |
Service cost |  | 6,034 |  | 1,746 |  | 1,785
Interest cost |  | 9,875 |  | 1,571 |  | 1,477
Plan amendments |  | 870 |  | 0 |  |
Actuarial (gain) loss |  | (42,977) |  | 10,341 |  |
Benefits paid |  | (16,118) |  | (3,913) |  |
Acquisitions |  | 416,150 |  | 0 |  |
Divestitures | [1] | 0 |  | 0 |  |
Reclass to liabilities held for sale |  | (26,608) |  | 0 |  |
Employee contributions |  | 478 |  | 283 |  |
Foreign exchange gain |  | (26,708) |  | (6,161) |  |
Settlements/curtailments |  | (582) |  | 0 |  |
Other |  | 331 |  | 0 |  |
Benefit obligation, ending balance |  | 373,857 |  | 53,112 |  | 49,245
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning balance |  | 9,444 |  | 10,941 |  |
Actual return on plan assets |  | 140 |  | 499 |  |
Employer contributions |  | 16,392 |  | 2,940 |  |
Benefits paid |  | (16,118) |  | (3,913) |  |
Acquisitions |  | 109,875 |  | 0 |  |
Divestitures | [1] | 0 |  | 0 |  |
Employee contributions |  | 478 |  | 283 |  |
Foreign exchange loss |  | (3,237) |  | (1,306) |  |
Settlements/curtailments |  | (582) |  | 0 |  |
Other |  | 314 |  | 0 |  |
Fair value of plan assets, Ending Balance |  | 116,706 |  | 9,444 |  | 10,941
Funded status |  | (257,151) |  | (43,668) |  |
Current liabilities (accrued expenses) |  | (7,498) |  | (1,316) |  |
Noncurrent liabilities (pension benefits) |  | (249,653) |  | (42,352) |  |
Net pension liability |  | (257,151) |  | (43,668) |  |
Prior service benefit |  | (1,052) |  | (321) |  |
Net amount recognized |  | $ (1,052) |  | $ (321) |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |  |  |
Discount Rate |  | 2.89% |  | 1.85% |  |
Rate of compensation increase |  | 3.17% |  | 3.40% |  |
Other Postretirement Benefits |  |  |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |  |  |
Benefit obligation, beginning balance |  | $ 64,500 |  | $ 62,832 |  |
Service cost |  | 137 |  | 216 |  | 309
Interest cost |  | 2,573 |  | 3,040 |  | 2,764
Actuarial (gain) loss |  | (5,682) |  | 3,741 |  |
Benefits paid |  | (5,042) |  | (5,329) |  |
Acquisitions |  | 2,607 |  | 0 |  |
Settlements/curtailments | [2] | (2,594) |  | 0 |  |
Benefit obligation, ending balance |  | 56,499 |  | 64,500 |  | 62,832
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |  |
Fair value of plan assets, beginning balance |  | 4,439 | [3] | 5,620 |  |
Actual return on plan assets |  | 280 |  | 214 |  |
Employer contributions |  | 3,615 |  | 3,934 |  |
Benefits paid |  | (5,042) |  | (5,329) |  |
Fair value of plan assets, Ending Balance |  | 3,292 | [4] | 4,439 | [3] | $ 5,620
Funded status |  | (53,207) |  | (60,061) |  |
Current liabilities (accrued expenses) |  | (3,560) |  | (3,637) |  |
Noncurrent liabilities (pension benefits) |  | (49,647) |  | (56,424) |  |
Net pension liability |  | (53,207) |  | (60,061) |  |
Prior service benefit |  | 239 |  | 334 |  |
Net amount recognized |  | $ 239 |  | $ 334 |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |  |  |
Discount Rate |  | 4.59% |  | 4.15% |  |
Rate of compensation increase |  | 3.50% |  | 3.50% |  |
[1] | Reduction in benefit obligations and plan assets in 2014 is in connection with the sale of our antioxidant, ibuprofen and propofol businesses and assets which closed on September 1, 2014. See Note 3 “Divestitures” for additional information about this transaction.
[2] | We assumed responsibility for one domestic OPEB plan in connection with the acquisition of Rockwood which covered a small number of active employees and retirees. This plan was terminated in the first quarter of 2015 and provisions were made for the affected employees and retirees to receive benefits under an existing plan.
[3] | As a result of our global operating and financing activities, we are exposed to market risks from changes in foreign currency exchange rates, which may adversely affect our operating results and financial position. When deemed appropriate, we minimize our risks from foreign currency exchange rate fluctuations through the use of foreign currency forward contracts. Unless otherwise noted, these derivative financial instruments are not designated as hedging instruments under ASC 815, Derivatives and Hedging. The foreign currency forward contracts are valued using broker quotations or market transactions in either the listed or over-the-counter markets. As such, these derivative instruments are classified within Level 2.
[4] | See Note 15 “Pension Plans and Other Postretirement Benefits” for further information about fair value measurements of our pension and postretirement plan assets, including the reconciliations of the plans’ Level 3 assets.

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- Definition The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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- Definition Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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- Definition The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost) -URI http://asc.fasb.org/extlink&oid=6504192 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6504226 + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Changes in the defined benefit obligation, not otherwise separately disclosed in the financial statements. + References No definition available. + Details
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- Definition The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=49173939 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 + Details
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- Definition This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 + Details
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