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Share Plans (Tables) | 12 Months Ended
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Dec. 31, 2013
Stock Option Activity | The following table summarizes stock option activity under all plans for the year ended December 31, 2013:
Shares and intrinsic value in millions | Number of shares | Weighted- average exercise price | Weighted- average remaining contractual life (years) | Aggregate intrinsic value
Outstanding as of January 1, 2013 | 8.4 |  | $ | 32.13 |  |  |
Granted | 1.0 |  | 50.83 |  |  |
Exercised | (2.9 | ) | 30.84 |  |  |
Forfeited | (0.2 | ) | 37.25 |  |  |
Expired | (0.1 | ) | 28.82 |  |  |
Outstanding as of December 31, 2013 | 6.2 |  | $ | 35.53 |  | 5.6 | $ | 255.3 |
Options exercisable as of December 31, 2013 | 4.7 |  | $ | 32.78 |  | 4.7 | $ | 205.8 |
Options expected to vest as of December 31, 2013 | 1.5 |  | $ | 44.27 |  | 8.5 | $ | 48.0 |
Stock Option Fair Value Assumptions | We estimated the fair value of each stock option award on the date of grant using a Black-Scholes option pricing model, modified for dividends and using the following weighted average assumptions:
| December 31
| 2013 |  | 2012 |  | 2011
| Granted by Pentair plans |  | Assumed in Merger | Granted by Pentair plans |  | Granted by Pentair plans
Risk-free interest rate | 0.69 | % |  | 0.02 - 0.68% |  | 0.96 | % |  | 1.51 | %
Expected dividend yield | 2.01 | % |  | 2.12 | % | 2.48 | % |  | 2.32 | %
Expected share price volatility | 36.0 | % |  | 33.0 | % | 36.5 | % |  | 35.5 | %
Expected term (years) | 5.7 |  |  | 0.1 - 5.1 |  | 5.7 |  |  | 5.5 |
Restricted Stock Activity | The following table summarizes restricted stock unit activity under all plans for the year ended December 31, 2013:
Shares in millions | Number of shares | Weighted average grant date fair value
Outstanding as of January 1, 2013 | 1.6 |  | $ | 38.97 |
Granted | 0.4 |  | 50.80 |
Vested | (0.5 | ) | 34.49 |
Forfeited | (0.2 | ) | 41.48 |
Outstanding as of December 31, 2013 | 1.3 |  | $ | 43.25 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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