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Share repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	6 Months Ended
	Jul. 31, 2018	Jun. 30, 2018	Oct. 10, 2017
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)		11,995
Value of treasury stock acquired		$ 809,900
Average cost of treasury stock (usd per share)		$ 67.52
Stock repurchase additional authorization amount			$ 1,389,999
Prior shares under repurchase authorization (in shares)			110,001
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)	3,872
Value of treasury stock acquired	$ 272,902
Average cost of treasury stock (usd per share)	$ 70.48
Remaining repurchase authorized amount	$ 1,426,313

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Stock Repurchase Program, Additional Authorized Amount

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

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Number of shares that have been repurchased during the period and are being held in treasury.

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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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