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Accounting Policies - Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Dec. 31, 2016 | Oct. 02, 2016 | Jul. 03, 2016 | Apr. 03, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net (loss) income |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | $ (2.3) | $ 26.5 | $ 27.2 | $ 21.7 | $ 17.5 | $ 21.9 | $ 28.6 | $ 16.2 | $ 73.1 | $ 84.2 | $ (112.9)
Net (loss) income |  |  |  |  |  |  |  |  | $ 73.1 | $ 84.2 | $ (112.9)
Shares (in shares) |  |  |  |  |  |  |  |  | 34.4 | 34.4 | 34.9
Dilutive securities, principally common stock options (in shares) |  |  |  |  |  |  |  |  |  | 0.1 |
Shares (in shares) |  |  |  |  |  |  |  |  | 34.4 | 34.5 | 34.9
Per Share Amount |  |  |  |  |  |  |  |  |  |  |
Per Share Amount (in dollars per share) | $ (0.07) | $ 0.77 | $ 0.79 | $ 0.63 | $ 0.51 | $ 0.63 | $ 0.83 | $ 0.47 | $ 2.12 | $ 2.45 | $ (3.24)
Dilutive securities, principally common stock options (in dollars per share) |  |  |  |  |  |  |  |  |  | (0.01) |
Per Share Amount (in dollars per share) | $ (0.07) | $ 0.77 | $ 0.79 | $ 0.63 | $ 0.51 | $ 0.63 | $ 0.83 | $ 0.47 | $ 2.12 | $ 2.44 | $ (3.24)
Securities not included in the computation of diluted EPS |  |  |  |  |  |  |  |  |  |  |
Options to purchase shares of Class A common stock |  |  |  |  |  |  |  |  |  | 0.1 | 0.3
Shipping and Handling Costs |  |  |  |  |  |  |  |  |  |  |
Shipping, Handling and Transportation Costs |  |  |  |  |  |  |  |  | $ 52.1 | $ 47.9 | $ 53.5
Research and Development Expense. |  |  |  |  |  |  |  |  |  |  |
Research and Development Expense |  |  |  |  |  |  |  |  | $ 29.0 | $ 26.5 | $ 23.5

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