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New Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained deficit | $ 584.8 | $ 650.1 |
Accounting Standards Update 2016-01 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Impact of adoption of ASU Adoption |  |  | $ 12.0
Accounting Standards Update 2016-16 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Impact of adoption of ASU Adoption |  |  | (0.2)
Retained deficit |  |  | 0.2
Accounting Standards Update 2018-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained deficit |  |  | $ 4.8

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