| Six Months | Twelve Months | Years Ended December 31, | ||||||||||||||||||||
| Dollars in Millions | Ended June 30, 2012 | Ended June 30, 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | |||||||||||||||
| Fixed Charges as defined: | ||||||||||||||||||||||
| Interest on long-term debt | $ | 147.0 | $ | 292.2 | $ | 287.0 | $ | 270.4 | $ | 251.5 | $ | 238.2 | $ | 214.9 | ||||||||
| Amortization of debt premium, discount and expense (net) | 2.5 | 4.9 | 4.8 | 5.1 | 4.8 | 4.6 | 4.6 | |||||||||||||||
| Interest component on rentals | 2.5 | 5.2 | 5.2 | 4.6 | 7.9 | 4.5 | 6.3 | |||||||||||||||
| Preference security dividend requirement of consolidated subsidiary | — | — | — | — | 14.2 | 11.7 | 11.7 | |||||||||||||||
| Total Fixed Charges (A) | $ | 152.0 | $ | 302.3 | $ | 297.0 | $ | 280.1 | $ | 278.4 | $ | 259.0 | $ | 237.5 | ||||||||
| Earnings as defined: | ||||||||||||||||||||||
| Pretax income (loss) from continuing operations | $ | 278.3 | $ | 569.5 | $ | 555.6 | $ | 535.4 | $ | 524.2 | $ | 542.1 | $ | 467.6 | ||||||||
| Total fixed charges | 152.0 | 302.3 | 297.0 | 280.1 | 278.4 | 259.0 | 237.5 | |||||||||||||||
| Pretax equity in (earnings) losses of investees | (1.3 | ) | (2.8 | ) | (2.9 | ) | (1.1 | ) | (2.2 | ) | (8 | ) | 18.1 | |||||||||
| Cash distributions from equity investees | 1.2 | 4.0 | 3.6 | 4.8 | 3.3 | 6.2 | 7.8 | |||||||||||||||
| Preference security dividend requirement from above | — | — | — | — | (14.2 | ) | (11.7 | ) | (11.7 | ) | ||||||||||||
| Total Earnings (B) | $ | 430.2 | $ | 873.0 | $ | 853.3 | $ | 819.2 | $ | 789.5 | $ | 787.6 | $ | 719.3 | ||||||||
| Ratio of Earnings to Fixed Charges (B/A) | 2.83 | 2.89 | 2.87 | 2.92 | 2.84 | 3.04 | 3.03 | |||||||||||||||
| Six Months | Twelve Months | Years Ended December 31, | |||||||||||||||||||||||||
| Dollars in Millions | Ended June 30, 2012 | Ended June 30, 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | ||||||||||||||||||||
| Fixed Charges as defined: | |||||||||||||||||||||||||||
| Interest on long-term debt | $ | 105.5 | $ | 210.9 | $ | 207.8 | $ | 192.4 | $ | 181.4 | $ | 166.6 | $ | 149.8 | |||||||||||||
| Amortization of debt premium, discount and expense (net) | 2.0 | 4.0 | 3.9 | 4.0 | 3.8 | 3.6 | 3.6 | ||||||||||||||||||||
| Interest component on rentals | 1.6 | 3.4 | 3.6 | 3.1 | 5.5 | 4.2 | 5.3 | ||||||||||||||||||||
| Total Fixed Charges(A) | $ | 109.1 | $ | 218.3 | $ | 215.3 | $ | 199.5 | $ | 190.7 | $ | 174.4 | $ | 158.7 | |||||||||||||
| Earnings as defined: | |||||||||||||||||||||||||||
| Pretax income from continuing operations | $ | 217.8 | $ | 482.3 | $ | 456.5 | $ | 433.6 | $ | 427.8 | $ | 440.1 | $ | 361.4 | |||||||||||||
| Total fixed charges | 109.1 | 218.3 | 215.3 | 199.5 | 190.7 | 174.4 | 158.7 | ||||||||||||||||||||
| Pre-tax equity in (earnings) losses of investees | 1.7 | 2.9 | 2.3 | 2.1 | 0.5 | (3 | ) | 19.5 | |||||||||||||||||||
| Total Earnings (B) | $ | 328.6 | $ | 703.5 | $ | 674.1 | $ | 635.2 | $ | 619.0 | $ | 611.5 | $ | 539.6 | |||||||||||||
| Ratio of Earnings to Fixed Charges (B/A) | 3.01 | 3.22 | 3.13 | 3.18 | 3.25 | 3.51 | 3.40 | ||||||||||||||||||||
