Shareholders' Equity (Dividends Declared) (Details) - Dividend Paid - USD ($) $ / shares in Units, $ in Millions	Nov. 10, 2016	Aug. 12, 2016	May 02, 2016	Feb. 26, 2016	Nov. 25, 2015	Aug. 24, 2015	May 21, 2015	Feb. 27, 2015	Nov. 26, 2014	Aug. 29, 2014	May 27, 2014	Mar. 14, 2014
Dividends Payable [Line Items]
Distribution Per Share (in dollars per share)	$ 0.65	$ 0.65	$ 0.65	$ 0.65	$ 0.65	$ 0.62	$ 0.62	$ 0.62	$ 0.62	$ 0.57	$ 0.57	$ 0.57
Aggregate Payment Amount	$ 48.8	$ 48.7	$ 48.7	$ 48.5	$ 48.5	$ 46.3	$ 46.3	$ 46.0	$ 46.0	$ 41.4	$ 41.5	$ 41.1
Qualified
Dividends Payable [Line Items]
Distribution Per Share (in dollars per share)	$ 0.0740419	$ 0.0740419	$ 0.0740419	$ 0.0740419	$ 0.0555382	$ 0.0529749	$ 0.0529749	$ 0.0529749	$ 0.0487594	$ 0.0448272	$ 0.0448272	$ 0.0448272
Non-Qualified
Dividends Payable [Line Items]
Distribution Per Share (in dollars per share)	0.4329602	0.4329602	0.4329602	0.4329602	0.4340030	0.4139721	0.4139721	0.4139721	0.4518556	0.4154156	0.4154156	0.4154156
Nondividend Distributions
Dividends Payable [Line Items]
Distribution Per Share (in dollars per share)	$ 0.1429979	$ 0.1429979	$ 0.1429979	$ 0.1429979	$ 0.1604588	$ 0.1530530	$ 0.1530530	$ 0.1530530	$ 0.1193850	$ 0.1097572	$ 0.1097572	$ 0.1097572