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Shareholder's Equity - Stock (Details) - $ / shares shares in Millions	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Preferred Stock, Shares Authorized (in shares)	100.0
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01
Common Stock, Shares Authorized (in shares)	1,000.0
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01
Incentive compensation [Member]
Class of Stock [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	15.0
Preferred Stock [Member]
Class of Stock [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		5.4

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Aggregate number of common shares reserved for future issuance.

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-Publisher FASB
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-Topic 210
-SubTopic 10
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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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