|
Condensed Consolidated Statements of Equity (Unaudited) (USD $)
In Millions, unless otherwise specified |
Total
|
Common Stock
Series A
|
Common Stock
Series B
|
Additional Paid-in Capital
|
Accumulated Other Comprehensive Loss
|
Retained Earnings
|
Noncontrolling Interest
|
|---|---|---|---|---|---|---|---|
| Balance at Dec. 31, 2014 | $ 39.8 | $ 0.9 | $ 0.1 | $ 24.0 | $ (2.3) | $ 25.8 | $ (8.7) |
| Increase (Decrease) in Member's Interest and Noncontrolling Interests [Roll Forward] | |||||||
| Net income | 86.1 | 84.6 | 1.5 | ||||
| Other comprehensive income | 0.7 | 0.5 | 0.2 | ||||
| Stock compensation | 8.3 | 8.5 | (0.2) | ||||
| Stock issued upon exercise of stock options | 4.6 | 4.6 | |||||
| Minimum withholding of taxes related to stock compensation | (5.2) | (5.2) | |||||
| Excess tax benefit from stock compensation | 4.6 | 4.6 | |||||
| Repurchases of common stock | (13.0) | 0 | (13.0) | ||||
| Balance at Mar. 31, 2015 | $ 125.9 | $ 0.9 | $ 0.1 | $ 23.5 | $ (1.8) | $ 110.4 | $ (7.2) |