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Revenue From Contracts With Customers - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Jan. 01, 2018
Disaggregation of Revenue [Line Items] |  |  |
Extended payment terms granted, minimum period to adjust contract consideration for the time value of money |  | 1 year |
Contract assets | $ 1.3 | $ 1.3 |
Contract liabilities | 31.6 | 31.6 | $ 21.4
Revenue recognized | 7.4 | 10.8 |
Deferred contract costs | 71.2 | 71.2 |
Amortization of deferred contract costs | 8.5 | 25.6 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-01-01 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unsatisfied performance obligations | 118.0 | 118.0 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unsatisfied performance obligations | 437.2 | 437.2 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unsatisfied performance obligations | 666.5 | 666.5 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unsatisfied performance obligations | $ 1,200.0 | $ 1,200.0 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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