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Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands							3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 15, 2015	Jun. 30, 2015	Jun. 15, 2015	Mar. 31, 2015	Mar. 13, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Aug. 06, 2015
Class of Stock [Line Items]
Dividends declared per common share, in usd per share							$ 0.3	$ 0.29	$ 0.9	$ 0.87
Dividends declared and paid, Preference shares							$ 5,595	$ 5,595	$ 16,786	$ 16,786
Retained Earnings
Class of Stock [Line Items]
Dividends declared and paid, Preference shares									16,786	16,786
Dividends declared and paid, Common shares									40,883	34,834
Common shares repurchased during period, Aggregate amount									$ 0	$ 468,200
Common Shares
Class of Stock [Line Items]
Dividends declared per common share, in usd per share		$ 0.3		$ 0.3		$ 0.30
Dividends per common share, in usd per share	$ 0.3		$ 0.3		$ 0.3
Share repurchase program, Authorized amount											$ 500,000
Common shares repurchased during period, Number of shares									2,026
Common shares repurchased during period, Aggregate amount									$ 211,500
Common shares repurchased during period, Average cost per share, in usd per share									$ 104.39
Share repurchase program, Remaining authorized aggregate amount	$ 313,200						$ 313,200		$ 313,200

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