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Share-based compensation plans (Details 4) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 Y | Dec. 31, 2010 | Dec. 31, 2009
Share-based compensation |  |  |
Weighted average remaining contractual life of exercisable options (in years) | 4.28 |  |
Total intrinsic value of options exercised | $ 4.2 | $ 3.0 | $ 0.1
Closing stock price | $ 35.23 |  |
Aggregate intrinsic value of options outstanding | 10.8 | 4.8 | 10.9
Aggregate intrinsic value of options exercisable | $ 8.4 | $ 2.1 | $ 1.9
$10.42 - $50.99 |  |  |
Share-based compensation |  |  |
Exercise price, low end of range (in dollars per share) | $ 10.42 |  |
Exercise price, high end of range (in dollars per share) | $ 50.99 |  |
Number outstanding (in shares) | 2,559,272 |  |
Weighted Average Remaining Contractual Life of options outstanding (in years) | 5.12 |  |
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 33.41 |  |
Number Exercisable (in shares) | 2,079,953 |  |
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 34.02 |  |
$10.42 - $25.01 |  |  |
Share-based compensation |  |  |
Exercise price, low end of range (in dollars per share) | $ 10.42 |  |
Exercise price, high end of range (in dollars per share) | $ 25.01 |  |
Number outstanding (in shares) | 452,162 |  |
Weighted Average Remaining Contractual Life of options outstanding (in years) | 5.80 |  |
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 22.73 |  |
Number Exercisable (in shares) | 343,009 |  |
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 22.57 |  |
$25.05 - $28.50 |  |  |
Share-based compensation |  |  |
Exercise price, low end of range (in dollars per share) | $ 25.05 |  |
Exercise price, high end of range (in dollars per share) | $ 28.50 |  |
Number outstanding (in shares) | 189,500 |  |
Weighted Average Remaining Contractual Life of options outstanding (in years) | 6.63 |  |
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 25.45 |  |
Number Exercisable (in shares) | 168,500 |  |
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 25.31 |  |
$28.95 - $28.95 |  |  |
Share-based compensation |  |  |
Exercise price, low end of range (in dollars per share) | $ 28.95 |  |
Exercise price, high end of range (in dollars per share) | $ 28.95 |  |
Number outstanding (in shares) | 265,447 |  |
Weighted Average Remaining Contractual Life of options outstanding (in years) | 5.57 |  |
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 28.95 |  |
Number Exercisable (in shares) | 267,447 |  |
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 28.95 |  |
$29.17 - $32.77 |  |  |
Share-based compensation |  |  |
Exercise price, low end of range (in dollars per share) | $ 29.17 |  |
Exercise price, high end of range (in dollars per share) | $ 32.77 |  |
Number outstanding (in shares) | 265,709 |  |
Weighted Average Remaining Contractual Life of options outstanding (in years) | 5.86 |  |
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 30.59 |  |
Number Exercisable (in shares) | 171,543 |  |
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 31.32 |  |
$33.00 - $37.36 |  |  |
Share-based compensation |  |  |
Exercise price, low end of range (in dollars per share) | $ 33.00 |  |
Exercise price, high end of range (in dollars per share) | $ 37.36 |  |
Number outstanding (in shares) | 274,750 |  |
Weighted Average Remaining Contractual Life of options outstanding (in years) | 8.32 |  |
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 34.36 |  |
Number Exercisable (in shares) | 44,750 |  |
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 34.63 |  |
$37.76 - $38.00 |  |  |
Share-based compensation |  |  |
Exercise price, low end of range (in dollars per share) | $ 37.76 |  |
Exercise price, high end of range (in dollars per share) | $ 38.11 |  |
Number outstanding (in shares) | 275,499 |  |
Weighted Average Remaining Contractual Life of options outstanding (in years) | 1.94 |  |
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 37.83 |  |
Number Exercisable (in shares) | 275,499 |  |
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 37.87 |  |
$38.11 - $39.24 |  |  |
Share-based compensation |  |  |
Exercise price, low end of range (in dollars per share) | $ 38.40 |  |
Exercise price, high end of range (in dollars per share) | $ 41.33 |  |
Number outstanding (in shares) | 279,224 |  |
Weighted Average Remaining Contractual Life of options outstanding (in years) | 3.94 |  |
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 38.23 |  |
Number Exercisable (in shares) | 279,224 |  |
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 38.23 |  |
$39.94 - $43.04 |  |  |
Share-based compensation |  |  |
Exercise price, low end of range (in dollars per share) | $ 42.97 |  |
Exercise price, high end of range (in dollars per share) | $ 44.97 |  |
Number outstanding (in shares) | 325,698 |  |
Weighted Average Remaining Contractual Life of options outstanding (in years) | 3.96 |  |
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 41.40 |  |
Number Exercisable (in shares) | 300,698 |  |
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 41.50 |  |
$44.87 - $50.50 |  |  |
Share-based compensation |  |  |
Exercise price, low end of range (in dollars per share) | $ 45.84 |  |
Exercise price, high end of range (in dollars per share) | $ 50.50 |  |
Number outstanding (in shares) | 221,783 |  |
Weighted Average Remaining Contractual Life of options outstanding (in years) | 4.24 |  |
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 45.64 |  |
Number Exercisable (in shares) | 221,783 |  |
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 54.64 |  |
$50.99 - $50.99 |  |  |
Share-based compensation |  |  |
Exercise price, low end of range (in dollars per share) | $ 50.99 |  |
Exercise price, high end of range (in dollars per share) | $ 50.99 |  |
Number outstanding (in shares) | 7,500 |  |
Weighted Average Remaining Contractual Life of options outstanding (in years) | 5.04 |  |
Weighted Average Exercise Price of options outstanding (in dollars per share) | $ 50.99 |  |
Number Exercisable (in shares) | 7,500 |  |
Weighted Average Exercise Price of options exercisable (in dollars per share) | $ 50.99 |  |

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- Definition The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a, b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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