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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Capitalized Contract Cost [Line Items] |  |  |
Remaining performance obligation | $ 1,500.0 | $ 1,500.0 |
Remaining performance obligation, percent to be recognized as revenue within one year | 50.00% | 50.00% |
Long-term contract assets | $ 5.8 | $ 5.8 |
Revenue recognized, previously included in deferred revenue | 86.3 | 190.9 |
Amortization of costs to fulfill contracts | 5.5 | 10.7 |
Cost to fulfill contract, net | 76.1 | 76.1 | $ 76.0
Sales Commissions |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Deferred commissions | 10.9 | 10.9 | $ 11.0
Amortization of costs to fulfill contracts | $ 1.7 | $ 3.4 |
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 |

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