v3.8.0.1

Earnings Per Share (Antidilutive Securities Excluded From the Computation of Diluted Earnings Per Share) (Details) - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average shares of antidilutive security excluded from computation of diluted earnings per share (in shares)	0.4	2.7	2.4
Stock Options | Treasury Stock Method
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average shares of antidilutive security excluded from computation of diluted earnings per share (in shares)	0.3	2.7	2.4
Weighted average exercise price of options excluded from computation of diluted earnings per share (in dollars per share)	$ 110.18	$ 83.97	$ 87.97
Stock Options | Direct Equity Adjustment
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average shares of antidilutive security excluded from computation of diluted earnings per share (in shares)	0.0	0.0	0.0
Antidilutive shares based on application of the treasury stock method [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average shares of antidilutive security excluded from computation of diluted earnings per share (in shares)	0.1	0.0	0.0
Employee And Non Employee Restricted Stock Shares Restricted Stock Units Performance Shares And Performance Units | Direct Equity Adjustment
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average shares of antidilutive security excluded from computation of diluted earnings per share (in shares)	0.0	0.0	0.0

X

- Definition

Antidilutive Securities Excluded from Computation of Earnings Per Share, Average Exercise Price

+ References

No definition available.

+ Details

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X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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