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Shareholder's Equity - Stock (Details) - $ / shares shares in Millions | Dec. 31, 2018 | Dec. 31, 2017
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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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