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Stock-Based Compensation Programs (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) installment $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares
Stock option and SSARs |  |  |
Stock-Based Compensation Programs |  |  |
Number of equal installments commencing one year from the date of grant | installment | 4 |  |
Vesting period | 1 year |  |
Expiration period of options | 10 years |  |
Outstanding Options, Number of Shares |  |  |
Beginning of year (in shares) | shares | 15,175,811 |  |
Granted (in shares) | shares | 1,624,395 |  |
Exercised (in shares) | shares | (4,173,273) |  |
Canceled/forfeited (in shares) | shares | (241,473) |  |
End of the period (in shares) | shares | 12,385,460 | 15,175,811 |
Vested and exercisable, end of period (in shares) | shares | 7,957,900 |  |
Reserved for future grants (in shares) | shares | 19,641,712 |  |
Outstanding Options, Weighted Average Exercise Price |  |  |
Beginning of year (in dollars per share) | $ / shares | $ 27.45 |  |
Granted (in dollars per share) | $ / shares | 51.42 |  |
Exercised (in dollars per share) | $ / shares | 21.19 |  |
Canceled/forfeited (in dollars per share) | $ / shares | 42.13 |  |
End of period (in dollars per share) | $ / shares | 32.41 | $ 27.45 |
Vested and exercisable, end of period (in dollars per share) | $ / shares | $ 26.82 |  |
Additional disclosures |  |  |
Weighted average remaining contractual term of options outstanding | 5 years 6 months |  |
Aggregate intrinsic value of options outstanding | $ | $ 400.0 |  |
Weighted average remaining contractual term of options vested and exercisable | 4 years 1 month 6 days |  |
Aggregate intrinsic value of options vested and exercisable | $ | $ 301.0 |  |
Total fair value of options vested | $ | $ 16.0 | $ 16.0 | $ 14.0
Weighted average fair value at grant date (in dollars per share) | $ / shares | $ 12.26 | $ 9.07 | $ 7.82
Stock options |  |  |
Additional disclosures |  |  |
Cash received from options exercised | $ | $ 41.0 | $ 29.0 | $ 21.0
Intrinsic value of options exercised | $ | 61.0 | $ 30.0 | $ 26.0
Tax benefit from exercise of options | $ | $ 35.0 |  |
Restricted shares and restricted stock units |  |  |
Stock-Based Compensation Programs |  |  |
Vesting period | 5 years |  |
PCEQs |  |  |
Stock-Based Compensation Programs |  |  |
Vesting period | 3 years |  |

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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options and stock-settled appreciation rights awards outstanding and currently exercisable. + References No definition available. + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of stock options and stock-settled appreciation rights outstanding and currently exercisable under the plan. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for vested portions of options and stock-settled appreciation rights outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance under the stock option and stock appreciation rights plan. + References No definition available. + Details
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