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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, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Definite-lived intangible assets, gross carrying value |  | $ 93.8 | $ 93.8
Accumulated amortization |  | 13.4 | 5.5
Definite-lived intangible assets, net carrying value |  | 80.4 | 88.3
Intangible assets (excluding goodwill), gross carrying value |  | 156.5 | 157.3
Intangible assets, net (excluding goodwill) |  | $ 143.1 | 151.8
Definite-lived intangible asset, useful life |  | 12 years |
Accumulated expense |  | $ 8.0 | 4.8
Estimated amortization of intangibles, year one |  | 8.0 |
Estimated amortization of intangibles, year two |  | 8.0 |
Estimated amortization of intangibles, year three |  | 7.9 |
Estimated amortization of intangibles, year four |  | 7.8 |
Estimated amortization of intangibles, year five |  | 7.6 |
Estimated amortization of intangibles, thereafter |  | 41.0 |
Customer Relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Definite-lived intangible assets, gross carrying value | [1] | 90.9 | 90.9
Accumulated amortization | [1] | 12.1 | 4.6
Definite-lived intangible assets, net carrying value | [1] | $ 78.8 | 86.3
Definite-lived intangible asset, useful life |  | 12 years |
Other Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Definite-lived intangible assets, gross carrying value | [1] | $ 2.9 | 2.9
Accumulated amortization | [1] | 1.3 | 0.9
Definite-lived intangible assets, net carrying value | [1] | $ 1.6 | $ 2.0
Definite-lived intangible asset, useful life |  | 7 years |
[1] | Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and 7 years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 12 years.

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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 of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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