Equity and Cash Incentive Program - Outstanding and Exercisable Awards (Details) - Stock Appreciation Rights (SARs) [Member] $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($) $ / shares shares
Exercise Price Range [Line Items]
Number of Outstanding Awards \| shares	2,979,933
Outstanding Awards, Aggregate Intrinsic Value \| $	$ 139,475
Number of Exercisable Awards \| shares	1,385,683
Exercisable Awards, Aggregate Intrinsic Value \| $	$ 88,121
Exercise Price Range 1 [Member]
Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 25.96
Exercise Price Range, Upper Range Limit	$ 58.69
Number of Outstanding Awards \| shares	336,295
Outstanding Awards, Weighted Average Exercise Price	$ 49.29
Outstanding Awards, Weighted Average Remaining Contractual Term	4 years 1 month 6 days
Outstanding Awards, Aggregate Intrinsic Value \| $	$ 25,891
Number of Exercisable Awards \| shares	336,295
Exercisable Awards, Weighted Average Exercise Price	$ 49.29
Exercisable Awards, Weighted Average Remaining Contractual Term	4 years 1 month 6 days
Exercisable Awards, Aggregate Intrinsic Value \| $	$ 25,891
Exercise Price Range 2 [Member]
Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 61.79
Exercise Price Range, Upper Range Limit	$ 84.94
Number of Outstanding Awards \| shares	1,716,140
Outstanding Awards, Weighted Average Exercise Price	$ 72.54
Outstanding Awards, Weighted Average Remaining Contractual Term	5 years 9 months 18 days
Outstanding Awards, Aggregate Intrinsic Value \| $	$ 92,163
Number of Exercisable Awards \| shares	1,049,388
Exercisable Awards, Weighted Average Exercise Price	$ 66.95
Exercisable Awards, Weighted Average Remaining Contractual Term	4 years 9 months 18 days
Exercisable Awards, Aggregate Intrinsic Value \| $	$ 62,230
Exercise Price Range 3 [Member]
Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 91.20
Exercise Price Range, Upper Range Limit	$ 119.86
Number of Outstanding Awards \| shares	927,498
Outstanding Awards, Weighted Average Exercise Price	$ 103.15
Outstanding Awards, Weighted Average Remaining Contractual Term	8 years 6 months
Outstanding Awards, Aggregate Intrinsic Value \| $	$ 21,421
Number of Exercisable Awards \| shares	0
Exercisable Awards, Weighted Average Exercise Price	$ 0
Exercisable Awards, Weighted Average Remaining Contractual Term	0 years
Exercisable Awards, Aggregate Intrinsic Value \| $	$ 0

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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