|
Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Accounts receivable, allowance for doubtful accounts (in dollars) | $ 1.5 | $ 0.5 |
| Property and equipment, accumulated depreciation (in dollars) | 985.8 | 1,095.5 |
| Intangible assets, accumulated amortization (in dollars) | $ 22.1 | $ 19.5 |
| Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Common stock, shares authorized | 250,000,000 | 250,000,000 |
| Common stock, shares issued | 76,500,000 | 76,100,000 |
| Common stock, shares outstanding | 72,500,000 | 73,200,000 |
| Treasury stock, shares | 4,000,000 | 2,900,000 |
| Series A Convertible Preferred Stock | ||
| Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Preferred stock, shares authorized | 80,000 | 80,000 |
| Preferred stock, shares issued | 80,000 | 80,000 |