Income From Continuing Operations Per Common Share - Accelerated Share Repurchases (Details) - ASR - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Feb. 06, 2017	Mar. 30, 2017
Accelerated Share Repurchases [Line Items]
Number of shares authorized to be repurchased under the program (in shares)	350.0
Cash paid under share repurchase program	$ 350
Number of shares received under share repurchase program (in shares)	2.9
Initial share price paid (in dollars per share)	$ 104.30
Percentage of total shares expected to be repurchased	85.00%
First Tranche - March 30, 2017
Accelerated Share Repurchases [Line Items]
Number of shares received under share repurchase program (in shares)		0.1

Accelerated Share Repurchases, Percentage of Total Shares Expected To Be Repurchased

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- Definition

Accelerated Share Repurchases, Settlement (Payment) or Receipt, Shares

+ References

No definition available.

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- Definition

The price paid per share to immediately purchase the targeted number of shares on the date of executing the accelerated share repurchase agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

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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

No definition available.

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- Definition

Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

+ References

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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