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Business Combinations, Goodwill and Intangible Assets, Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |  |  |
Goodwill, gross |  | $ 37.2 |  |
Impairment of the carrying value of goodwill |  | (18.4) |  |
Goodwill |  | 18.8 |  |
Goodwill, acquired |  | 25.2 |  |
Goodwill impairment | $ 18.4 | 0.0 | $ 18.4 | $ 0.0
Goodwill, total increase |  | 25.2 |  |
Goodwill, gross |  | 62.4 | 37.2 |
Impairment of the carrying value of goodwill |  | (18.4) | (18.4) |
Goodwill |  | $ 44.0 | $ 18.8 |
Period over which goodwill is expected to be deductible for income tax purposes |  | 15 years |  |

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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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