Share-Based Payments Stock Options and SOSARs (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercise of stock options under equity compensation plans	$ 34.6	$ 44.4	$ 88.8
SOSARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period	0.0	0.0	0.0
Options and SOSARs
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at the beginning of the period (in shares)	2.2
Granted (in shares)	0.1
Exercised	(1.0)
Forfeited	0.0
Outstanding at the end of the period (in shares)	1.3	2.2
Exercisable at beginning of period (in shares)	1.8
Exercisable at end of period (in shares)	1.1	1.8
Weighted-average exercise price of shares outstanding, beginning of the period (in dollars per share)	$ 45.33
Weighted-average exercise price of shares granted (in dollars per share)	74.81
Weighted-average exercise price of shares exercised (in dollars per share)	43.96
Weighted-average exercise price of shares forfeited (in dollars per share)	0.00
Weighted-average exercise price of shares outstanding, end of the period (in dollars per share)	49.49	$ 45.33
Weighted-average exercise price of shares exercisable, beginning or period (in dollars per share)	44.36
Weighted-average exercise price of shares exercisable, end of period (in dollars per share)	$ 46.02	$ 44.36
Weighted-average remaining contractual life outstanding	4 years 9 months 18 days	5 years
Weighted-average remaining contractual life exercisable	4 years	4 years 3 months 18 days
Aggregate intrinsic value of shares outstanding, beginning of period (in dollars)	$ 64.6
Aggregate intrinsic value of shares outstanding, end of period (in dollars)	58.0	$ 64.6
Aggregate intrinsic value of shares exercisable, beginning of period (in dollars)	54.9
Aggregate intrinsic value of shares exercisable, end of period (in dollars)	51.2	54.9
Total intrinsic value of stock options exercised	34.1	30.9	$ 36.0
Exercise of stock options under equity compensation plans	34.6	44.4	88.8
Tax benefit from stock options exercised	$ 10.0	$ 8.2	$ 7.7
Options, SOSARs, RSUs, DSUs, PSUs, and PU Awards
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares authorized and available for issuance (in shares)	6.8
Performance shares (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period	0.1	0.2	0.2
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	2 years 9 months 22 days	2 years 9 months 18 days	2 years 9 months 18 days
Minimum \| Options and SOSARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	21.65%	22.66%	22.39%
Minimum \| Performance shares (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	12.73%	12.45%	12.18%
Maximum \| Options and SOSARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	29.90%	26.57%	25.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	5 years 8 months 12 days	7 years 6 months	7 years 8 months 12 days
Maximum \| Performance shares (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	62.28%	72.41%	69.37%

Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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The cash inflow associated with the amount received from the stock plan during the period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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