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Employee Compensation and Benefit Plans - Schedule of Stock Option Activity (Footnote) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options which expired unexercised	0	4,913
Market-based options that have not met performance criteria (in shares)	5,167
Average common stock trading price to determine market condition for options exercise	$ 484.19
Net aggregate intrinsic value of stock options outstanding	$ 0.0
Market-based options outstanding (in shares)	51,563
Market-based options outstanding, exercisable (in shares)	46,396
Weighted average remaining contractual term of options outstanding	3 years 21 days
Weighted average remaining contractual term of options exercisable	2 years 7 months 28 days
Total fair value of stock options vested and became exercisable	$ 0.3	$ 0.6	$ 0.6
Chief Financial Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)		2,212
Stock options granted, exercise price (in dollars per share)		$ 32.55
Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)			17,799
Stock options granted, exercise price (in dollars per share)			$ 61.80

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(4)
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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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

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

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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