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Stock -Based Compensation - Performance Stock Units, RPSUs and MSUs Plan description (Details)	12 Months Ended
	Dec. 31, 2019 shares
RPSUs
Stock-Based Compensation
Award vesting period	3 years
Award vesting right, percentage	200.00%
RPSUs | Share-based Payment Arrangement, Tranche One
Stock-Based Compensation
Award vesting right, percentage	0.00%
RPSUs | Share-based Payment Arrangement, Tranche Two
Stock-Based Compensation
Award vesting right, percentage	25.00%
RPSUs | Share-based Payment Arrangement, Tranche Three
Stock-Based Compensation
Award vesting right, percentage	100.00%
RPSUs | Share-based Payment Arrangement, Tranche Four
Stock-Based Compensation
Award vesting right, percentage	15.00%
RPSUs | Share-based Payment Arrangement, Tranche Five
Stock-Based Compensation
Award vesting right, percentage	200.00%
MSUs
Stock-Based Compensation
Award vesting right, percentage	200.00%
MSUs | Share-based Payment Arrangement, Tranche One
Stock-Based Compensation
Award vesting right, percentage	25.00%
Vested (in shares)	0
MSUs | Share-based Payment Arrangement, Tranche Two
Stock-Based Compensation
Award vesting right, percentage	25.00%
MSUs | Share-based Payment Arrangement, Tranche Three
Stock-Based Compensation
Award vesting right, percentage	25.00%
MSUs | Share-based Payment Arrangement, Tranche Four
Stock-Based Compensation
Award vesting right, percentage	100.00%
MSUs | Share-based Payment Arrangement, Tranche Five
Stock-Based Compensation
Award vesting right, percentage	100.00%

X

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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