Debt - Summary of Interest Expense (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Debt Instruments [Abstract] | |||
| Interest incurred | $ 12.2 | $ 1.1 | $ 1.5 |
| Less: interest capitalized as property, plant and equipment | (0.5) | ||
| Interest expense, net | $ 11.7 | $ 1.1 | $ 1.5 |