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Summary of Significant Accounting Policies - Income taxes (Details)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Summary of Significant Accounting Policies
Effective income tax rate (as a percent)	24.20%	21.20%

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- References

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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