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CONSOLIDATED STATEMENT OF EQUITY (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Exercise of options, tax benefit |  |  | $ 0.2
Dividends per share (in dollars per share) | $ 0.62 | $ 0.46 | $ 0.24
3.5% Notes |  |  |
Interest rate (as a percent) | 3.50% | 3.50% | 3.50%

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