Stock Plans (LTIP Target Performance Shares) (Details) - Performance Shares [Member]	3 Months Ended
	Mar. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of period (in shares)	2,525,000
Shares granted (in shares)	1,669,000
Shares earned (in shares)	(887,000)
Shares forfeited (in shares)
Balance at end of period (in shares)	3,307,000