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Accounting Changes and Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating lease ROU assets | $ 512.7 |  |  |  |
Operating leases | 545.1 |  |  |  |
Finance lease ROU assets | 531.0 |  | $ 545.5 |  |
Finance lease liabilities | $ 617.1 |  |  |  |
Decrease to accumulated deficit |  |  |  | $ (5,897.5) | $ (6,217.6)
ASU 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating lease ROU assets |  | $ 545.1 |  |  |
Operating leases |  | 558.1 |  |  |
Finance lease ROU assets |  | 26.2 |  |  |
Finance lease liabilities |  | 26.2 |  |  |
Decrease to accumulated deficit |  | 1.2 |  |  |
Net reduction in ROU assets |  | $ 14.2 |  |  |

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