Shareholders' Equity (Details) $ in Millions	Mar. 31, 2019 USD ($)
First Quarter 2019 Repurchase Program
Class of Stock [Line Items]
Authorized repurchase amount	$ 200
Second Quarter 2018 Repurchase Program
Class of Stock [Line Items]
Remaining authorized repurchase amount	$ 25

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.

No definition available.

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Period Type:	duration