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Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands			3 Months Ended
	Mar. 31, 2016	Mar. 15, 2016	Mar. 31, 2016	Mar. 31, 2015	Feb. 19, 2016
Class of Stock [Line Items]
Dividends declared per common share			$ 0.31	$ 0.30
Dividends declared and paid, Preference shares			$ 5,595,000	$ 5,595,000
Retained Earnings
Class of Stock [Line Items]
Dividends declared and paid, Preference shares			5,595,000	5,595,000
Dividends declared and paid, Common shares			$ 13,285,000	$ 13,720,000
Common Shares
Class of Stock [Line Items]
Dividends declared per common share		$ 0.31
Dividends per common share	$ 0.31
Share repurchase program, Authorized amount					$ 500,000,000
Common shares repurchased during period, Number of shares			769
Common shares repurchased during period, Aggregate amount			$ 85,200,000
Common shares repurchased during period, Average cost per share, in usd per share			$ 110.72
Share repurchase program, Remaining authorized aggregate amount	$ 494,100,000		$ 494,100,000

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Aggregate dividends paid during the period for each share of common stock outstanding.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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