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Business Combinations, Goodwill and Intangible Assets, Identifiable Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Identifiable intangible assets |  |  |
Original cost | $ 43.9 | $ 43.9 |
Accumulated amortization | (14.3) | (11.5) |
Net book value | 29.6 | 32.4 |
Amortization of definite-lived intangible assets | $ 2.8 | $ 1.8 | $ 1.4
Noncompete Agreements |  |  |
Finite-Lived Intangible Assets |  |  |
Weighted-Average Amortization Period (in years) | 5 years | 5 years |
Identifiable intangible assets |  |  |
Original cost | $ 5.4 | $ 5.4 |
Accumulated amortization | (1.3) | (0.3) |
Net book value | $ 4.1 | $ 5.1 |
Trade Names |  |  |
Finite-Lived Intangible Assets |  |  |
Weighted-Average Amortization Period (in years) | 10 years | 10 years |
Identifiable intangible assets |  |  |
Original cost | $ 2.4 | $ 2.4 |
Accumulated amortization | (0.3) | (0.1) |
Net book value | $ 2.1 | $ 2.3 |
Customer relationships |  |  |
Finite-Lived Intangible Assets |  |  |
Weighted-Average Amortization Period (in years) | 24 years | 24 years |
Identifiable intangible assets |  |  |
Original cost | $ 36.1 | $ 36.1 |
Accumulated amortization | (12.7) | (11.1) |
Net book value | $ 23.4 | $ 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=118932676&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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