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Restructuring and Impairment Activities (Tables) | 3 Months Ended
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Mar. 31, 2018
Restructuring and Related Activities [Abstract] |
Changes in Restructuring Liabilities | Changes in the restructuring liabilities, substantially all of which are employee-related, during the periods ended March 31, 2018 and December 31, 2017 are summarized as follows ($ in millions):
| Three Months Ended |  | Year Ended
| March 31, 2018 |  | December 31, 2017
Balance at beginning of year | $ | 1.7 |  |  | $ | 4.3 |
Accruals for announced programs | 0.4 |  |  | 3.5 |
Cash payments | (0.6 | ) |  | (6.4 | )
Other | 1.8 |  |  | — |
Exchange rate impacts | 0.1 |  |  | 0.3 |
Balance at end of period | $ | 3.4 |  |  | $ | 1.7 |

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 + Details
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