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Stock-Based Compensation Stock Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option Award Vesting Period	3 years
Unrecognized Pretax Compensation Expense Related to Stock Options	$ 3,000
Remaining Weighted-Average Recognition Period	6 months 21 days
Dow [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option, Expiration Period	10 years
EIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock options		$ 16,000	$ 50,000
Tax Benefit from Compensation Expense		(3,000)
OIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock options	$ 21,000	3,000
Tax Benefit from Compensation Expense	$ (4,000)	$ (1,000)
Employee Stock [Member] \| OIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value		$ 6.06
Employee Stock [Member] \| EIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value		$ 7.29	$ 15.46
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding at beginning of period	10,045
Stock options granted during the period	1,459
Stock options forfeited/expired during the period	(157)
Stock options outstanding at end of period	8,998	10,045
Stock options exercisable at end of period	6,695
Stock options outstanding, weighted average exercise price beginning of period	$ 32.47
Stock options granted, weighted average price	31.16
Stock options exercised during the period, weighted average exercise price	$ 24.96
Stock options exercised during the period	(2,349)
Stock options forfeited/expired, weighted average price	$ 34.24
Stock options outstanding, weighted average exercise price end of period	34.21	$ 32.47
Stock options exercisable, weighted average exercise price	$ 33.96
Stock options outstanding, weighted average remaining contractual term	5 years 3 months 7 days	4 years 8 months 23 days
Stock options exercisable, weighted average remaining contractual term	4 years 3 months 7 days
Stock options outstanding, intrinsic value	$ 50,077	$ 20,186
Stock options exercisable, intrinsic value	$ 38,799
Grants between 2013 and 2015 [Member] \| Equity Option [Member] \| EIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option, Expiration Period	7 years
Grants between 2016 and 2018 [Member] \| Equity Option [Member] \| EIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option, Expiration Period	10 years
Grants between June 2019 and 2020 [Member] \| Equity Option [Member] \| OIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option, Expiration Period	10 years