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Goodwill - Changes in Carrying Amount of Definite-Lived Intangible Assets Excluding Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Definite-lived intangible assets, gross carrying value |  | $ 93.8 |  | $ 1.9
Accumulated amortization |  | 5.5 | [1] | 0.5
Definite-lived intangible assets, net carrying value |  | 88.3 |  | 1.4
Intangible assets (excluding goodwill), gross carrying value |  | 157.3 | [1] | 10.7
Intangible assets, net (excluding goodwill) |  | $ 151.8 | [1] | 10.2
Definite-lived intangible asset, useful life |  | 12 years |  |
Accumulated expense |  | $ 4.8 |  |
Estimated amortization of intangibles, 2018 |  | 8.0 |  |
Estimated amortization of intangibles, 2019 |  | 8.0 |  |
Estimated amortization of intangibles, 2020 |  | 8.0 |  |
Estimated amortization of intangibles, 2021 |  | 8.0 |  |
Estimated amortization of intangibles, 2022 |  | 7.7 |  |
Estimated amortization of intangibles, thereafter |  | 48.6 |  |
Customer Relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Definite-lived intangible assets, gross carrying value | [2] | 90.9 |  | 0.8
Accumulated amortization | [2] | 4.6 |  | 0.1
Definite-lived intangible assets, net carrying value | [2] | $ 86.3 |  | 0.7
Definite-lived intangible asset, useful life |  | 12 years |  |
Other Intangible Assets |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Definite-lived intangible assets, gross carrying value | [2] | $ 2.9 |  | 1.1
Accumulated amortization | [2] | 0.9 |  | 0.4
Definite-lived intangible assets, net carrying value | [2] | $ 2.0 |  | $ 0.7
Definite-lived intangible asset, useful life |  | 6 years |  |
[1] | Amounts at December 31, 2017 include intangible assets acquired in the TBEI acquisition - see Note 2 – Acquisitions.
[2] | Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and 6 years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 12 years.

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