Shareholders' Equity (Shares Repurchased Under Share Repurchase Program) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended		3 Months Ended		9 Months Ended		1 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Treasury Stock [Member]	Sep. 30, 2014 Stock Repurchase Program Board Authorized Repurchases [Member]	Sep. 30, 2013 Stock Repurchase Program Board Authorized Repurchases [Member]	Sep. 30, 2014 Stock Repurchase Program Board Authorized Repurchases [Member]	Sep. 30, 2013 Stock Repurchase Program Board Authorized Repurchases [Member]	Oct. 27, 2014 Subsequent Event [Member] Stock Repurchase Program Board Authorized Repurchases [Member]	Oct. 20, 2014 Subsequent Event [Member] Stock Repurchase Program Board Authorized Repurchases [Member]
Class of Stock [Line Items]
Additional authorization under share repurchase program								$ 250
Shares repurchased (in shares)			4.4	0	8.0	0.1	1.4
Aggregate purchase price	418.2	418.2	235.9	0	415.7	4.9	68.5
Average purchase price per share (in dollars per share)			$ 53.15	$ 0.00	$ 51.98	$ 40.81	$ 49.29
Amount available for share repurchases under the share repurchase program							$ 281.5