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Stockholders' Equity - Employee Stock Purchase Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock Compensation Plans
Number of shares issued	239,590	233,712	157,277
Stock compensation expense	$ 166.6	$ 148.2	$ 133.1
Remaining shares available	9,882,122	7,023,328
Employee Stock
Stock Compensation Plans
Employment period for eligibility to participate in the plan	1 month
Number of shares issued	239,590	233,712	157,277
Stock compensation expense	$ 3.4	$ 3.7	$ 3.2
Remaining shares available	453,931
Employee Stock | Minimum
Stock Compensation Plans
Number of employee working hours per week for eligibility to participate in the plan	20 hours

X

- Definition

Represents the period of employ after which an employee who works a minimum of 20 hours per week can participate under the plan.

+ References

No definition available.

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- Definition

Represents the number of hours that a part-time or regular full-time employee must work per week to participate under the plan.

+ References

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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