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Business Combinations, Goodwill and Intangible Assets, Identifiable Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Identifiable intangible assets |  |  |  |
Original cost |  | $ 43.9 | $ 34.7 |
Accumulated amortization |  | (11.5) | (9.7) |
Net book value |  | 32.4 | 25.0 |
Impairment of Intangible Assets | $ 2.6 |  |  |
Amortization of definite-lived intangible assets |  | $ 1.8 | $ 1.4 | $ 1.5
Noncompete Agreements |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Weighted-Average Amortization Period (in years) |  | 5 years |  |
Identifiable intangible assets |  |  |  |
Original cost |  | $ 5.4 |  |
Accumulated amortization |  | (0.3) |  |
Net book value |  | $ 5.1 |  |
Trade Names |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Weighted-Average Amortization Period (in years) |  | 10 years |  |
Identifiable intangible assets |  |  |  |
Original cost |  | $ 2.4 |  |
Accumulated amortization |  | (0.1) |  |
Net book value |  | $ 2.3 |  |
Customer relationships |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Weighted-Average Amortization Period (in years) |  | 24 years | 25 years |
Identifiable intangible assets |  |  |  |
Original cost |  | $ 36.1 | $ 34.7 |
Accumulated amortization |  | (11.1) | (9.7) |
Net book value |  | $ 25.0 | $ 25.0 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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