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Goodwill (Tables) | 6 Months Ended
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Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | A reconciliation of the change in the carrying value of goodwill was as follows (in millions):
| June 30, 2017 |  | December 31, 2016
| (In millions of dollars)
Balance at beginning of year | $ | 37.2 |  |  | $ | 37.2 |
Goodwill impairment | (18.4 | ) |  | — |
Balance at end of period | $ | 18.8 |  |  | $ | 37.2 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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