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Acquisition Acquisition - Selected Unaudited Pro-forma Combined Statement of Earnings (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 223.8 | $ 236.2 | $ 188.4 | $ 178.5 | $ 215.5 | $ 196.0 | $ 164.4 | $ 168.3 | $ 826.9 | $ 744.2 | $ 755.7
Earnings (Loss) | $ 79.4 | $ (17.8) | $ 4.4 | $ (0.4) | $ 31.9 | $ 10.5 | $ (30.9) | $ (5.0) | $ 65.6 | $ 6.5 | $ 19.8
Per Share - Basic | $ 0.88 | $ (0.20) | $ 0.05 | $ 0 | $ 0.36 | $ 0.12 | $ (0.35) | $ (0.06) | $ 0.73 | $ 0.07 | $ 0.22
Per Share - Diluted | $ 0.87 | $ (0.20) | $ 0.05 | $ 0 | $ 0.35 | $ 0.12 | $ (0.35) | $ (0.06) | $ 0.72 | $ 0.07 | $ 0.22
Compex Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Pro-forma |  |  |  |  |  |  |  |  | $ 827.5 | $ 755.7 |
Pro-forma |  |  |  |  |  |  |  |  | $ 66.3 | $ 7.4 |
Pro-forma |  |  |  |  |  |  |  |  | $ 0.74 | $ 0.08 |
Pro-forma |  |  |  |  |  |  |  |  | $ 0.73 | $ 0.08 |

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