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Goodwill, Intangible and Long-Lived Assets - Summary of Changes in the Carrying Value of Goodwill by Reportable Segment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Carrying value of goodwill by reportable operating segment |  |  |
Opening balance | $ 6,956.7 | $ 6,814.3 | $ 1,126.9
Acquisition | 14.2 |  | 5,675.2
Acquisitions |  | 213.6 |
Currency and other adjustments | 33.9 | (71.2) | 12.2
Closing balance | 7,004.8 | 6,956.7 | 6,814.3
Accumulated impairment losses | 19.4 |  |
The Americas Group |  |  |
Carrying value of goodwill by reportable operating segment |  |  |
Opening balance | 2,256.6 | 2,555.6 | 285.4
Acquisition |  |  | 2,276.1
Acquisitions |  | (273.9) |
Currency and other adjustments |  | (25.1) | (5.9)
Closing balance | 2,256.6 | 2,256.6 | 2,555.6
Accumulated impairment losses | 10.5 |  |
Consumer Brands Group |  |  |
Carrying value of goodwill by reportable operating segment |  |  |
Opening balance | 1,753.8 | 2,233.2 | 699.9
Acquisition |  |  | 1,473.2
Acquisitions |  | (413.3) |
Currency and other adjustments | 0.1 | (66.1) | 60.1
Closing balance | 1,753.9 | 1,753.8 | 2,233.2
Accumulated impairment losses | 8.1 |  |
Performance Coatings Group |  |  |
Carrying value of goodwill by reportable operating segment |  |  |
Opening balance | 2,946.3 | 2,025.5 | 141.6
Acquisition | 14.2 |  | 1,925.9
Acquisitions |  | 900.8 |
Currency and other adjustments | 33.8 | 20.0 | (42.0)
Closing balance | 2,994.3 | $ 2,946.3 | $ 2,025.5
Accumulated impairment losses | $ 0.8 |  |

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