Three Months Ended March 31, | Year Ended December 31, | ||||||||||||||||||
| 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | ||||||||||||||
| Earnings: | |||||||||||||||||||
| Earnings (1) | $ | 82.3 | $ | 562.4 | $ | 344.9 | $ | (279.7 | ) | $ | 185.3 | $ | 941.5 | ||||||
| Fixed charges | $ | 24.8 | $ | 91.5 | $ | 87.2 | $ | 104.1 | $ | 107.0 | $ | 284.1 | |||||||
| Fixed Charges: | |||||||||||||||||||
| Interest expense and amortization of debt discount and debt issuance costs | $ | 14.3 | $ | 46.2 | $ | 36.7 | $ | 58.6 | $ | 52.9 | $ | 210.0 | |||||||
| Interest component of rent expense | $ | 10.5 | $ | 45.3 | $ | 50.5 | $ | 45.5 | $ | 54.1 | $ | 74.1 | |||||||
| Ratio of earnings to Fixed charges | 4.3 | 7.1 | 5.0 | (1.7 | ) | 2.7 | 4.3 | ||||||||||||
