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Recently Issued and Adopted Accounting Pronouncements and Regulatory Items Revenue From Contracts With Customers (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Prepaid and other current assets | $ 432.6 | $ 388.3 | $ 303.5
Liabilities and Equity |  |  |
Accrued and other liabilities | 570.8 | 564.2 | 479.4
Amounts as originally reported |  |  |
Assets |  |  |
Prepaid and other current assets | 382.9 |  | 303.5
Liabilities and Equity |  |  |
Accrued and other liabilities | 521.1 |  | $ 479.4
Accounting Standards Update 2014-09 | Adjustment |  |  |
Assets |  |  |
Prepaid and other current assets | (49.7) | 84.8 |
Liabilities and Equity |  |  |
Accrued and other liabilities | $ (49.7) | $ 84.8 |

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