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Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenue from External Customer [Line Items]
Contract assets	$ 0.0		$ 0.0
Deferred Revenue, revenue recognized	21.6
Capitalized contract cost, costs to fulfill a contract	0.2		$ 0.1
Capitalized contract cost, amortization	$ 0.1	$ 0.0
Contract operations revenue
Revenue from External Customer [Line Items]
Services generally billed in number of months in advance of service commencement	1 month
Expected timing of satisfaction of service, period	30 days
Contract operations revenue | Minimum
Revenue from External Customer [Line Items]
Typical initial contract terms	6 months
Contract operations revenue | Maximum
Revenue from External Customer [Line Items]
Typical initial contract terms	5 years
Retail parts and services revenue
Revenue from External Customer [Line Items]
Expected timing of satisfaction of service, period	30 days

X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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- Definition

Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
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-Section 50
-Paragraph 1A
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-URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306

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- Definition

Amount of revenue recognized that was previously reported as deferred or unearned revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response))
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 606
-SubTopic 10
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Services generally billed in number of months in advance of service commencement.

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- Definition

Represents typical initial contract terms.

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