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Revenue - Deferred Revenue (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Change in Contract with Customer, Liability [Roll Forward]
Balance at January 1, 2018	$ 34.2
New prepay contracts entered into during the period	3.4
Revenue recognized that was included in the contract liability balance at the beginning of the period	11.6
Revenue recognized related to contracts entered into during the period	1.7
Other changes	0.1
Balance at March 31, 2018	$ 24.2

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- Definition

Change in Contract with Customer, Liability [Roll Forward]

+ References

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- Definition

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- Definition

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- Definition

Contract With Customer, Liability, Revenue Recognized, Contracts Entered During Period

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045

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

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