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Shareholders' equity (Share Repurchase Program) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	11 Months Ended	12 Months Ended	1 Months Ended
	Aug. 31, 2011	Jun. 30, 2012	Jun. 30, 2012	Aug. 31, 2012 Subsequent Event [Member]
Equity [Abstract]
Number of shares authorized under repurchase program		11.3
Market price per share		$ 28.90
Repurchases of common shares		$ 325,900,000	$ 325,941,000
Subsequent Event [Line Items]
Authorized repurchase of common stock under Share Repurchase Program	500,000,000			750,000,000
Authorized repurchase of common stock under Share Repurchase Program, additional				$ 250,000,000

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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