CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions |
Sep. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Current assets: | ||
| Allowance for doubtful accounts | $ 10.9 | $ 9.0 |
| Stockholders’ equity: | ||
| Common Stock, par or stated value per share (in dollars per share) | $ 0.01 | $ 0.01 |
| Common Stock, shares authorized (in shares) | 200,000,000 | 200,000,000 |
| Common Stock, shares issued (in shares) | 35,367,264 | 35,367,264 |
| Treasury stock, shares (in shares) | 1,540,418 | 1,577,960 |