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Significant Accounting Policies, New Accounting Guidance, Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | $ 394.9 |  |  |  | $ 372.4 |  |  |  |  | $ 394.9 | $ 372.4 |
Net sales | 566.6 | $ 512.7 | $ 508.3 | $ 515.5 | $ 488.3 | $ 349.8 | $ 317.7 | $ 347.2 |  | 2,103.1 | $ 1,503.0 | $ 1,352.5
ASU 2014-09 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | $ 1.0 |  |  |  |  |  |  |  |  | $ 1.0 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | ASU 2014-09 [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 3.0 |  |  |

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