Share-based Compensation (Summary of Stock Award Information) (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Total intrinsic value of awards exercised (in millions):
Cash received from exercise of options	$ 37.0	$ 23.9
Income tax benefit related to stock-based compensation expense	$ 28.0	$ 20.1
Employee Stock Option [Member]
Weighted average grant-date fair value per share of awards granted:
Weighted average grant-date fair value (in dollars per share)	$ 14.73	$ 11.40
Total intrinsic value of awards exercised (in millions):
Total intrinsic value of awards exercised	$ 93.5	$ 43.7
Stock Appreciation Rights (SARs) [Member]
Weighted average grant-date fair value per share of awards granted:
Weighted average grant-date fair value (in dollars per share)	$ 10.78	$ 8.95
Total intrinsic value of awards exercised (in millions):
Total intrinsic value of awards exercised	$ 40.1	$ 17.7
Performance Stock Appreciation Rights (PSARs) [Member]
Weighted average grant-date fair value per share of awards granted:
Weighted average grant-date fair value (in dollars per share)	$ 0.00	$ 8.15
Total intrinsic value of awards exercised (in millions):
Total intrinsic value of awards exercised	$ 0.2	$ 0.2
Restricted Stock Units (RSUs) [Member]
Weighted average grant-date fair value per share of awards granted:
Weighted average grant-date fair value, other than options (in dollars per share)	$ 51.97	$ 39.72
PSUs [Member]
Weighted average grant-date fair value per share of awards granted:
Weighted average grant-date fair value, other than options (in dollars per share)	51.69	40.41
PGUs [Member]
Weighted average grant-date fair value per share of awards granted:
Weighted average grant-date fair value, other than options (in dollars per share)	$ 0.00	$ 44.04
Minimum [Member]
Assumptions used to estimate fair value of options, share appreciation rights (SARs) and PSARs granted:
Risk-free interest rate	0.96%	0.81%
Expected life	3 years	3 years 1 month 6 days
Expected volatility	23.10%	25.50%
Maximum [Member]
Assumptions used to estimate fair value of options, share appreciation rights (SARs) and PSARs granted:
Risk-free interest rate	1.89%	1.77%
Expected life	5 years 6 months	5 years 1 month 6 days
Expected volatility	30.10%	28.70%

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The weighted average fair value at grant date for nonvested equity-based awards issued 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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 risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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