|
Stock-Based Compensation (Components of Stock-Based Compensation Expense) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||
| Stock-based compensation, equity classified awards | $ 2.4 | $ 3.2 |
| Stock-based compensation, liability classified awards | 0.3 | (0.2) |
| Pre-tax compensation expense | 2.7 | 3.0 |
| Tax provision | (1.0) | (1.1) |
| Total stock-based compensation expense, net of tax | $ 1.7 | $ 1.9 |