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Reportable Segment Information - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) store branch foreign_country | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) store segment branch foreign_country | Dec. 31, 2018 USD ($) store | Dec. 31, 2017 USD ($) store
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reporting segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Net external sales | $ | $ 4,114.4 | $ 4,867.7 | $ 4,877.8 | $ 4,040.9 | $ 4,064.2 | $ 4,731.5 | $ 4,773.8 | $ 3,965.0 | $ 17,900.8 | $ 17,534.5 | $ 14,983.8
Long lived assets | $ | 15,865.0 |  |  |  | 14,790.0 |  |  |  | 15,865.0 | 14,790.0 | 15,493.0
Identifiable assets | $ | $ 20,496.2 |  |  |  | $ 19,134.3 |  |  |  | $ 20,496.2 | $ 19,134.3 | $ 19,899.5
Percent of assets of consolidated foreign subsidiaries to Company's assets | 23.60% |  |  |  | 25.10% |  |  |  | 23.60% | 25.10% | 26.40%
Non-US |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net external sales | $ |  |  |  |  |  |  |  |  | $ 3,679.0 | $ 4,028.0 | $ 2,960.0
Long lived assets | $ | $ 3,211.0 |  |  |  | $ 3,290.0 |  |  |  | 3,211.0 | 3,290.0 | 3,691.0
Identifiable assets | $ | $ 4,829.0 |  |  |  | $ 4,809.0 |  |  |  | $ 4,829.0 | $ 4,809.0 | $ 5,254.0
The Americas Group |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of company-operated stores | 4,758 |  |  |  |  |  |  |  | 4,758 |  |
Number of subsidiaries in foreign countries | foreign_country | 10 |  |  |  |  |  |  |  | 10 |  |
Number of net new stores |  |  |  |  |  |  |  |  | 62 | 76 | 101
New stores opened |  |  |  |  |  |  |  |  | 94 |  |
Number of stores closed |  |  |  |  |  |  |  |  | 32 |  |
The Americas Group | United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
New stores opened |  |  |  |  |  |  |  |  | 83 |  |
Number of stores closed |  |  |  |  |  |  |  |  | 6 |  |
The Americas Group | Canada |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
New stores opened |  |  |  |  |  |  |  |  | 7 |  |
The Americas Group | South America |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
New stores opened |  |  |  |  |  |  |  |  | 4 |  |
Number of stores closed |  |  |  |  |  |  |  |  | 17 |  |
The Americas Group | Mexico |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of stores closed |  |  |  |  |  |  |  |  | 9 |  |
Consumer Brands Group |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of subsidiaries in foreign countries | foreign_country | 6 |  |  |  |  |  |  |  | 6 |  |
Percent of sales of one group including intersegment transfers represented products sold through other stores group |  |  |  |  |  |  |  |  | 57.00% |  |
Performance Coatings Group |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of company-operated stores | branch | 281 |  |  |  |  |  |  |  | 281 |  |
Number of subsidiaries in foreign countries | foreign_country | 45 |  |  |  |  |  |  |  | 45 |  |
New stores opened | branch |  |  |  |  |  |  |  |  | 3 |  |
Number of stores closed | branch |  |  |  |  |  |  |  |  | 4 |  |
Net decrease in stores | branch |  |  |  |  |  |  |  |  | 1 |  |

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