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Recently Issued and Adopted Accounting Pronouncements and Regulatory Items Revenue Recognition (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Prepaid and other current assets | $ 534.5 |  | $ 326.4
Liabilities and Equity |  |  |
Accrued and other liabilities | 611.5 |  | 497.7
Accounting Standards Update 2014-09 |  |  |
Assets |  |  |
Prepaid and other current assets | 534.5 | $ 411.2 |
Liabilities and Equity |  |  |
Accrued and other liabilities | 611.5 | 582.5 |
Accounting Standards Update 2014-09 | Adjustment due to ASC 606 |  |  |
Assets |  |  |
Prepaid and other current assets | (95.9) |  |
Liabilities and Equity |  |  |
Accrued and other liabilities | (95.9) |  |
Accounting Standards Update 2014-09 | Amounts without ASC 606 adjustment |  |  |
Assets |  |  |
Prepaid and other current assets | 438.6 |  |
Liabilities and Equity |  |  |
Accrued and other liabilities | $ 515.6 |  |
Amounts as originally reported | Accounting Standards Update 2014-09 |  |  |
Assets |  |  |
Prepaid and other current assets |  |  | 326.4
Liabilities and Equity |  |  |
Accrued and other liabilities |  |  | $ 497.7
Adjustment | Accounting Standards Update 2014-09 |  |  |
Assets |  |  |
Prepaid and other current assets |  | 84.8 |
Liabilities and Equity |  |  |
Accrued and other liabilities |  | $ 84.8 |

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