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Share repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended
	May 02, 2018	Mar. 31, 2018	Oct. 10, 2017
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)		4,197
Value of treasury stock acquired		$ 298,377
Average cost of treasury stock (usd per share)		$ 71.09
Stock repurchase additional authorization amount			$ 1,252,961
Prior shares under repurchase authorization (in shares)			247,039
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)	4,350
Value of treasury stock acquired	$ 275,992
Average cost of treasury stock (usd per share)	$ 63.44
Remaining repurchase authorized amount	$ 544,747

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Stock Repurchase Program, Additional Authorized Amount

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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.

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Amount remaining of a stock repurchase plan authorized.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
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Number of shares that have been repurchased during the period and are being held in treasury.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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