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New Accounting Pronouncements Revenue Recognition (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Inventories, net | $ 800.2 | $ 758.9 | $ 766.3
Prepayments and other current assets (including contract assets) | 185.1 | 154.8 | 145.4
Accounts payable and other accrued expenses (including contract liabilities) |  | 2,270.4 |
Retained Earnings | $ 4,958.8 | 4,532.9 | 4,531.0
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |
Inventories, net |  | (7.4) |
Prepayments and other current assets (including contract assets) |  | 9.4 |
Accounts payable and other accrued expenses (including contract liabilities) |  | 0.1 |
Retained earnings |  | 1.9 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Transferred over Time [Member] |  |  |
Retained earnings |  | 2.0 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Inventories, net |  |  | 766.3
Prepayments and other current assets (including contract assets) |  |  | 145.4
Accounts payable and other accrued expenses (including contract liabilities) |  |  | 2,270.3
Retained Earnings |  |  | $ 4,531.0
Contract with Customer, Variable Consideration [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |
Retained Earnings |  | $ 0.1 |

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