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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Capitalized Contract Cost [Line Items] |  |  |
Amortization of costs to fulfill contracts | $ 4.2 | $ 14.9 |
Remaining performance obligation | 1,400.0 | 1,400.0 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Long-term contract assets | 5.6 | 5.6 |
Revenue recognized, previously included in deferred revenue | 64.6 | 255.5 |
Cost to fulfill contract, net | 77.2 | 77.2 | $ 76.0
Sales Commissions |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Deferred commissions | 11.8 | 11.8 | $ 11.0
Amortization of costs to fulfill contracts | $ 1.8 | $ 5.2 |
Technology | Minimum |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Period over which payment is generally received for contracts |  | 30 days |
Technology | Maximum |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Period over which payment is generally received for contracts |  | 60 days |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Remaining performance obligation, percent to be recognized as revenue | 45.00% | 45.00% |
Period over which remaining performance obligations are expected to be recognized as revenue | 1 year 3 months | 1 year 3 months |

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