Condensed Statement of Changes in Stockholders' Equity Statement - USD ($) $ in Millions	Total	Class A [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock, Common [Member]	AOCI Including Portion Attributable to Noncontrolling Interest [Member]	Stockholders' Equity, Total [Member]
Stockholders' Equity Attributable to Parent at Dec. 31, 2018								$ 1,237.6
Common Stock, Shares, Outstanding at Dec. 31, 2018			105,461,817
Common Stock, Value, Outstanding at Dec. 31, 2018			$ 1.1
Additional Paid in Capital, Common Stock at Dec. 31, 2018				$ 1,100.9
Treasury Stock, Value at Dec. 31, 2018						$ (2,381.0)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Dec. 31, 2018							$ (196.6)
Retained Earnings (Accumulated Deficit) at Dec. 31, 2018					$ 2,713.2
Net Income (Loss) Attributable to Parent					(163.0)			(163.0)
Dividends, Common Stock, Cash					(1.4)			(1.4)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			736,078
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture			$ 0.0
Stock Issued During Period, Value, Restricted Stock Award, Gross				12.3				12.3
Shares Issued, Shares, Share-based Payment Arrangement, Forfeited			(83,998)
Shares Granted, Value, Share-based Payment Arrangement, Forfeited			$ 0.0
Payment, Tax Withholding, Share-based Payment Arrangement				(13.0)				(13.0)
Stock Issued During Period, Shares, Employee Stock Purchase Plans			55,977
Stock Issued During Period, Value, Employee Stock Purchase Plan				1.3				1.3
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			(190,581)
Other Comprehensive Income (Loss), Net of Tax							(141.7)	(141.7)
Stockholders' Equity Attributable to Parent at Jun. 27, 2019								1,455.9
Common Stock, Shares, Outstanding at Jun. 27, 2019			105,399,855
Additional Paid in Capital, Common Stock at Jun. 27, 2019				1,125.6
Treasury Stock, Value at Jun. 27, 2019						(2,456.8)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Jun. 27, 2019							(250.9)
Retained Earnings (Accumulated Deficit) at Jun. 27, 2019					3,036.9
Common Stock, Value, Outstanding at Jun. 27, 2019			$ 1.1
Stockholders' Equity Attributable to Parent at Dec. 31, 2019	$ 1,761.4							$ 1,761.4
Common Stock, Shares, Outstanding at Dec. 31, 2019			104,882,379
Common Stock, Value, Outstanding at Dec. 31, 2019		$ 1.1	$ 1.1
Additional Paid in Capital, Common Stock at Dec. 31, 2019	1,125.0			$ 1,125.0
Treasury Stock, Value at Dec. 31, 2019	2,456.8					$ (2,456.8)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Dec. 31, 2019	(109.2)						$ (109.2)
Retained Earnings (Accumulated Deficit) at Dec. 31, 2019	$ 3,201.3				$ 3,201.3
Common Stock, Dividends, Per Share, Declared	$ 0.01
Net Income (Loss) Attributable to Parent	$ (163.0)
Payment, Tax Withholding, Share-based Payment Arrangement	13.1
Other Comprehensive Income (Loss), Net of Tax	(141.7)
Stockholders' Equity Attributable to Parent at Apr. 02, 2020	1,455.9
Additional Paid in Capital, Common Stock at Apr. 02, 2020	1,125.6
Treasury Stock, Value at Apr. 02, 2020	2,456.8
Accumulated Other Comprehensive Income (Loss), Net of Tax at Apr. 02, 2020	(250.9)
Retained Earnings (Accumulated Deficit) at Apr. 02, 2020	$ 3,036.9