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Significant Accounting Policies, New Accounting Guidance (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
New Accounting Guidance [Abstract] |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | $ 97.1 |  |  |  | $ 96.9 |  |  |  | $ 97.1 | $ 96.9 |
Equity | 533.9 |  |  |  | 490.1 |  |  |  | 533.9 | 490.1 |
Net sales | 556.7 | $ 541.0 | $ 548.9 | $ 566.1 | 566.6 | $ 512.7 | $ 508.3 | $ 515.5 | 2,212.7 | 2,103.1 | $ 1,503.0
Retained earnings | 472.1 |  |  |  | 394.9 |  |  |  | 472.1 | 394.9 |
ASU 2016-16 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Guidance [Abstract] |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  | 0.0 |  |  |  |  | 0.0 |
Retained earnings |  |  |  |  | (8.3) |  |  |  |  | (8.3) |
ASU 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Guidance [Abstract] |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  |  |  |  |  | 0.4
Equity |  |  |  |  |  |  |  |  |  |  | $ 0.4
ASU 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Guidance [Abstract] |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  | (0.2) |  |  |  |  | (0.2) |
Retained earnings |  |  |  |  | 0.7 |  |  |  |  | 0.7 |
ASU 2014-09 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Guidance [Abstract] |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  | 0.7 |  |  |  |  | 0.7 |
ASU 2014-09 [Member] | Effect of Adoption of ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Guidance [Abstract] |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 0.6 |  |  |  |  |  |  |  | 0.6 |  |
Net sales |  |  |  |  |  |  |  |  | (4.4) | 3.0 |
Retained earnings | $ (2.7) |  |  |  | $ 0.7 |  |  |  | $ (2.7) | $ 0.7 |

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