v3.10.0.1

Stock Repurchases, Dividends and Earnings per Share - Share Repurchase Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity [Abstract]
Number of shares repurchased (in shares)	3.3	2.1	7.1	3.7
Amount paid	$ 219.5	$ 131.8	$ 474.0	$ 230.7
Weighted average cost per share (in dollars per share)	$ 67.47	$ 62.87	$ 67.05	$ 61.81

X

- Definition

Treasury Stock, Shares, Acquired, Shares Repurchased Pursuant to Share Repurchase Program

+ References

No definition available.

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X

- Definition

Treasury Stock, Value, Acquired, Shares Repurchased Pursuant to Share Repurchase Program

+ References

No definition available.

+ Details

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- References

No definition available.

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X

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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