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General (Schedule of Impact of Adoption on Opening Financial Statement Balances) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Apr. 01, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Current assets | $ 1,414.0 | $ 1,947.5 | $ 1,773.1
Total assets | 8,580.3 | 9,111.2 | 8,967.6
Current liabilities | $ 1,590.7 | 2,516.5 | 2,412.4
Total liabilities |  | 5,833.8 | $ 5,708.9
Impact of Adoption | Revenue Recognition ASU 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Current assets |  | 174.4 |
Total assets |  | 143.6 |
Current liabilities |  | 104.1 |
Total liabilities |  | $ 124.9 |

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