Subsequent Events - Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
1 Months Ended | 3 Months Ended | 12 Months Ended | |
---|---|---|---|---|
May 08, 2019 |
Dec. 31, 2017 |
Mar. 31, 2019 |
Dec. 31, 2018 |
|
Subsequent Event [Line Items] | ||||
Shares repurchased during period (in shares) | 0.3 | 3.3 | ||
Value of shares repurchased during period | $ 8.0 | $ 2.0 | $ 25.9 | |
Weighted average price of shares repurchased (in dollars per share) | $ 7.10 | $ 7.91 | ||
Share repurchase program, unfulfilled requests (in shares) | 12.0 | |||
Share repurchase program, unfulfilled requests | $ 85.0 | |||
Stock repurchase program, unfilled requests, value per share (in dollars per share) | $ 7.10 | |||
Subsequent event | ||||
Subsequent Event [Line Items] | ||||
Shares repurchased during period (in shares) | 0.5 | |||
Value of shares repurchased during period | $ 3.2 | |||
Weighted average price of shares repurchased (in dollars per share) | $ 7.10 |