Stock-based Compensation (Schedule of Restricted Stock Unit Two-Year Performance Cycle) (Details) shares in Millions	12 Months Ended
	Dec. 31, 2015 shares
Two Year Performance Cycle Award Year Two Thousand Thirteen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Two year Performance Cycle Payout As A Percent Of The Base Award	127.00%
Estimated number of shares	0.0
Two Year Performance Cycle Award Year Two Thousand Fourteen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Two year Performance Cycle Payout As A Percent Of The Base Award	224.70%
Estimated number of shares	0.0