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Stockholders' Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended | 36 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011
Summary of cash dividends paid |  |  |  |
Total Cash Dividends Paid | $ 87.4 | $ 79.7 | $ 75.7 | $ 242.8
Dividends per common share | $ 0.52 | $ 0.50 | $ 0.48 |

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