Accounting Policies (Details 5) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 31, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net (loss) income
Net (loss) income	$ (118.2)	$ (25.7)	$ 19.3	$ 11.6	$ (7.7)	$ 22.6	$ 21.3	$ 14.1	$ (112.9)	$ 50.3	$ 58.6
Net (loss) income									$ (112.9)	$ 50.3	$ 58.6
Shares (in shares)									34.9	35.3	35.5
Dilutive securities, principally common stock options (in shares)										0.1	0.1
Shares (in shares)									34.9	35.4	35.6
Per Share Amount
Per Share Amount (in dollars per share)	$ (3.41)	$ (0.73)	$ 0.55	$ 0.33	$ (0.22)	$ 0.64	$ 0.60	$ 0.40	$ (3.24)	$ 1.42	$ 1.65
Per Share Amount (in dollars per share)	$ (3.41)	$ (0.73)	$ 0.55	$ 0.33	$ (0.22)	$ 0.64	$ 0.60	$ 0.40	$ (3.24)	$ 1.42	$ 1.65
Securities not included in the computation of diluted EPS
Options to purchase shares of Class A common stock									0.3	0.3	0.2
Financial Instruments
Cash flow hedges, fair value	$ 0.0				$ 0.0				$ 0.0	$ 0.0
Shipping and Handling Costs
Shipping, Handling and Transportation Costs									53.5	61.8	$ 61.3
Research and Development Expense.
Research and Development Expense									$ 23.5	$ 22.5	$ 21.5