Compensation Plans (Schedule of Stock Option Awards) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, cancelled | shares	(2,070)
Weighted average exercise price, cancelled | $ / shares	$ 58.17
Options outstanding, December 31, 2014 | shares	18,895
Number of shares, granted | shares	5,812
Number of shares, exercised | shares	(4,736)
Number of shares, forfeited | shares	(440)
Options outstanding, December 31, 2015 | shares	18,160
Number of shares, exercisable, December 31, 2015 | shares	8,632
Weighted average exercise price outstanding, December 31, 2014 | $ / shares	$ 48.34
Weighted average exercise price, granted | $ / shares	73.21
Weighted average exercise price, exercised | $ / shares	41.38
Weighted average exercise price, forfeited | $ / shares	62.33
Weighted average exercise price outstanding, December 31, 2015 | $ / shares	54.89
Weighted average exercise price, exercisable, December 31, 2015 | $ / shares	$ 45.82
Weighted average remaining contractual term, outstanding, years	4 years 3 months 7 days
Weighted average remaining contractual term, exercisable, years	2 years 11 months 5 days
Aggregate intrinsic value, outstanding | $	$ 232,453
Aggregate intrinsic value, exercisable | $	$ 179,408
Performance Chemicals [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, cancelled | shares	699
Weighted average exercise price, cancelled | $ / shares	$ 53.59