| Twelve
      Months Ended December 31, | Six Months Ended June
      30, | |||||||||||||||||||||||
| 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | |||||||||||||||||||
| Earnings: | ||||||||||||||||||||||||
| Pre-tax
      income from continuing operations before adjustment for noncontrolling
      interests in consolidated subsidiaries or income or loss from equity
      investees | $ | 370.5 | $ | 390.0 | $ | 390.6 | $ | 373.5 | $ | 330.2 | $ | 182.4 | ||||||||||||
| Add:
      Fixed charges (from below) | 43.9 | 37.5 | 65.2 | 80.2 | 64.5 | 31.9 | ||||||||||||||||||
| Add:
      Amortization of capitalized interest | 0.2 | 0.3 | 0.4 | 0.6 | 0.7 | 0.4 | ||||||||||||||||||
| Add:
      Distributed income of equity investee | — | — | — | 0.7 | 1.8 | 1.0 | ||||||||||||||||||
| Subtract:
      Capitalized interest expense | 0.7 | 0.6 | 0.9 | 2.0 | 0.5 | 0.2 | ||||||||||||||||||
| $ | 413.9 | $ | 427.2 | $ | 455.3 | $ | 453.0 | $ | 396.7 | $ | 215.5 | |||||||||||||
| Fixed
      charges: | ||||||||||||||||||||||||
| Interest
      expense (including amortization of debt issuance costs and debt discounts
      and premiums) | $ | 35.6 | $ | 31.9 | $ | 58.5 | $ | 71.3 | $ | 57.0 | $ | 28.3 | ||||||||||||
| Add:
      Capitalized interest expense | 0.7 | 0.6 | 0.9 | 2.0 | 0.5 | 0.2 | ||||||||||||||||||
| Add:
      Portion of rental expense representing interest | 7.6 | 5.0 | 5.8 | 6.9 | 7.0 | 3.4 | ||||||||||||||||||
| $ | 43.9 | $ | 37.5 | $ | 65.2 | $ | 80.2 | $ | 64.5 | $ | 31.9 | |||||||||||||
| Ratio
      of earnings to fixed charges | 9.4 | 11.4 | 7.0 | 5.6 | 6.2 | 6.8 | ||||||||||||||||||