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Interim Financial Statements (Recent Accounting Pronouncements) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating Lease Liabilities | $ 349.2 |  |
Operating Lease Assets | $ 336.0 |  | $ 0.0
Accounting Standards Update 2016-02 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating Lease Liabilities |  | $ 358.1 |
Operating Lease Assets |  | $ 344.6 |

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