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Acquisitions (Narrative) (Details) AUD in Thousands, $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 04, 2017 USD ($) | Dec. 07, 2015 USD ($) | Jun. 12, 2015 USD ($) | May 12, 2015 USD ($) | Jun. 12, 2015 USD ($) | Jun. 30, 2018 AUD | Jul. 01, 2017 USD ($) businesses | Apr. 01, 2017 USD ($) | Oct. 03, 2015 USD ($) | Apr. 04, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preliminary goodwill allocation |  |  |  |  |  |  |  |  |  |  | $ 2,471,459 | $ 2,274,426 | $ 2,293,365
Emilceramica S.r.l |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value | $ 186,099 |  |  |  |  |  |  |  |  |  |  |  |
Preliminary goodwill allocation | 59,491 |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets subject to amortization | 2,348 |  |  |  |  |  |  |  |  |  |  |  |
Godfrey Hirst Group |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value |  |  |  |  |  |  |  |  |  |  | $ 434,171 |  |
IVC group and KAI group |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value |  |  |  |  | $ 1,341,050 |  |  |  |  |  |  |  |
IVC group |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value |  |  | $ 1,146,437 |  |  |  |  |  |  |  |  |  |
KAI group |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value |  |  |  | $ 194,613 |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  | 90.00% |  |  |  |  |  |  |  |  |
Ownership interest controlled by a third party |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
Assumed indebtedness |  |  |  | $ 24 |  |  |  |  |  |  |  |  |
Cash payments to acquire entity |  |  |  | 169,540 |  |  |  |  |  |  |  |  |
Debt paid |  |  |  | $ 25,073 |  |  |  |  |  |  |  |  |
Xtratherm |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value |  | $ 158,851 |  |  |  |  |  |  |  |  |  |  |
Tradenames | Emilceramica S.r.l |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived tradename intangible asset | $ 16,196 |  |  |  |  |  |  |  |  |  |  |  |
Global Ceramic | Global Ceramic Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value |  |  |  |  |  |  | $ 37,250 |  |  |  |  |  |
Preliminary goodwill allocation |  |  |  |  |  |  | $ 1,002 |  |  |  |  |  |
Number of acquisitions | businesses |  |  |  |  |  |  | 2 |  |  |  |  |  |
Global Ceramic | Unidentified Ceramic Business |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value |  |  |  |  |  |  |  |  | $ 20,423 |  |  |  |
Flooring NA | Flooring NA Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value |  |  |  |  |  |  | $ 26,623 |  |  |  |  |  |
Flooring ROW | Flooring ROW Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value |  |  |  |  |  |  |  | $ 1,407 |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |  |  | $ 827 |  |  |  |  |
Flooring ROW | Unidentified Wood Business |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value |  |  |  |  |  |  |  |  |  | $ 2,822 |  |  |
Scenario, Forecast | Godfrey Hirst Group |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise value | AUD |  |  |  |  |  | AUD 556,000 |  |  |  |  |  |  |

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