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Goodwill (Tables) | 9 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Goodwill | The following table summarizes goodwill at the balance sheet dates:
(in millions) |  | Total |
At December 31, 2018 |  |  |  |
Gross cost (1) |  | $ | 601.4 |
Accumulated impairment losses |  |  | (236.5 | )
Net book amount |  | $ | 364.9 |
Exchange effect |  |  | (4.4 | )
At September 30, 2019 |  |  |  |
Gross cost (1) |  | $ | 597.0 |
Accumulated impairment losses |  |  | (236.5 | )
Net book amount |  | $ | 360.5 |
(1) | Gross cost for 2019 and 2018 is net of $ 298.5 million of historical accumulated amortization.

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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