CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (PARENTHETICAL) - USD ($) $ in Millions |
6 Months Ended | |
---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
|
Statement of Stockholders' Equity [Abstract] | ||
Underwriters' discount | $ 0.0 | $ 1.9 |