Shareholders' Equity Cash Dividends Declared Per Common Share (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Equity [Abstract]
Cash dividends declared and paid per common share (in dollars per share)	$ 0.55	$ 0.53	$ 1.1	$ 1.06