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Stock Compensation (Details) - USD ($)	3 Months Ended		9 Months Ended
Stock Compensation (Details) - USD ($)	Sep. 28, 2017	Sep. 29, 2016	Sep. 28, 2017	Sep. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation			$ 15,900,000	$ 35,700,000
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]			Stock Compensation The Company recognized net stock compensation expense of $4.8 and $6.3 for the three months ended September 28, 2017 and September 29, 2016, respectively, and $15.9 and $35.2 for the nine months ended September 28, 2017 and September 29, 2016, respectively. The additional stock compensation expense recognized during 2016 was related to executive retirements and severance recorded in the second quarter of 2016. During the nine months ended September 28, 2017, 650,899 shares of class A common stock were granted under the Company's stock compensation plan with aggregate grant date fair values of $35.4. Additionally, awards of 671,545 shares of class A common stock granted under the Company's stock compensation plans with an aggregate grant date fair value of $25.7 vested during the nine months ended September 28, 2017.
Class A [Member] \| Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted			650,899
Fair Value Of Shares Granted			$ 35,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			671,545
Grant date value of shares vested			$ 25,700,000.0
Selling General And Administrative Expense [Member] \| LTIA AND Prior Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation	$ 4,800,000.0	$ 6,300,000.0	$ 15,900,000.0	$ 35,200,000.0