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Revenue - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2018 | Dec. 31, 2017
Revenue Recognition [Line Items] |  |  |  |  |
Revenue recognition, description of timing |  | As our production cycle is typically six months or less, it is expected that goods related to the revenue represented in that adjustment will be shipped and billed within the current year. |  |  |
Contract assets recorded for revenue, unbilled | $ 37.7 | $ 37.7 |  | $ 35.2 | $ 38.1
Reduction in inventory |  | $ (28.6) | $ (11.6) |  |
Revenue recognition, description of payment terms |  | one year or less |  |  |
Revenue recognition, remaining performance obligation, expected timing of satisfaction | 1 year | 1 year |  |  |
Accounting Standards Update No. 2014-09 |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Contract assets recorded for revenue, unbilled |  |  |  |  | $ 38.1
Offset recorded to opening balance of retained earnings, taxes |  | $ 1.3 |  |  |
Contract assets billed and reclassified to trade accounts receivable | $ 35.0 |  |  |  |
Increase in revenue | 2.8 |  |  |  |
Increase in gross margin | $ 0.6 |  |  |  |
Increase in diluted earnings per share | $ 0.005 |  |  |  |
Reduction in inventory | $ 32.8 |  |  |  |
Accounting Standards Update No. 2014-09 | Retained Earnings |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Reduction in inventory associated with revenue recorded to retained earnings | $ 33.0 | $ 33.0 |  |  |

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