Revenue - Narrative (Details) $ in Millions |
3 Months Ended | 6 Months Ended |
|---|---|---|
|
Jun. 30, 2018
USD ($)
|
Jun. 30, 2018
USD ($)
|
|
| Deferred contract costs and capitalized sales commissions | ||
| Capitalized Contract Cost [Line Items] | ||
| Capitalized contract cost, gross | $ 91.5 | $ 91.5 |
| Capitalized sales commissions to selling, general and administrative expenses | ||
| Capitalized Contract Cost [Line Items] | ||
| Capitalized contract cost, amortization | 2.9 | 5.5 |
| Other deferred contract costs as a reduction of revenue | ||
| Capitalized Contract Cost [Line Items] | ||
| Capitalized contract cost, amortization | $ 1.4 | $ 2.8 |
| Collection | ||
| Capitalized Contract Cost [Line Items] | ||
| Standard contract term | 3 years |