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 Attributable to Parent at Dec. 31, 2019	$ 1,761.4
Common Stock, Shares, Outstanding at Dec. 31, 2019			104,882,379
Common Stock, Value, Outstanding at Dec. 31, 2019			$ 1.1
Additional Paid in Capital, Common Stock at Dec. 31, 2019				$ 1,125.0
Treasury Stock, Value at Dec. 31, 2019						$ (2,456.8)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Dec. 31, 2019							$ (109.2)
Retained Earnings (Accumulated Deficit) at Dec. 31, 2019					$ 3,201.3
Net Income (Loss) Attributable to Parent	(418.9)				(418.9)
Dividends, Common Stock, Cash	(2.4)				(2.4)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			972,614
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture			$ 0.0
Stock Issued During Period, Value, Restricted Stock Award, Gross	13.3			13.3
Shares Issued, Shares, Share-based Payment Arrangement, Forfeited			(87,903)
Shares Granted, Value, Share-based Payment Arrangement, Forfeited			$ 0.0
Payment, Tax Withholding, Share-based Payment Arrangement	(13.7)		$ 0.0	(13.7)
Stock Issued During Period, Shares, Employee Stock Purchase Plans			55,656
Stock Issued During Period, Value, Employee Stock Purchase Plan	1.3			1.3
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			(197,918)
Treasury Stock, Shares, Acquired			0
Treasury Stock, Value, Acquired, Cost Method	0.1		$ 0.0			0.1
Other Comprehensive Income (Loss), Net of Tax	(72.1)						(72.1)
Stockholders' Equity Attributable to Parent at Jul. 02, 2020	1,269.0
Common Stock, Shares, Outstanding at Jul. 02, 2020			105,624,828
Additional Paid in Capital, Common Stock at Jul. 02, 2020				1,125.9
Treasury Stock, Value at Jul. 02, 2020						(2,456.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Jul. 02, 2020							(181.3)
Retained Earnings (Accumulated Deficit) at Jul. 02, 2020					2,780.0
Common Stock, Value, Outstanding at Jul. 02, 2020			$ 1.1
Stockholders' Equity Attributable to Parent at Dec. 31, 2019	1,761.4
Common Stock, Shares, Outstanding at Dec. 31, 2019			104,882,379
Common Stock, Value, Outstanding at Dec. 31, 2019			$ 1.1
Additional Paid in Capital, Common Stock at Dec. 31, 2019				1,125.0
Treasury Stock, Value at Dec. 31, 2019						(2,456.8)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Dec. 31, 2019							(109.2)
Retained Earnings (Accumulated Deficit) at Dec. 31, 2019					3,201.3
Net Income (Loss) Attributable to Parent	(574.4)
Payment, Tax Withholding, Share-based Payment Arrangement	(14.0)
Other Comprehensive Income (Loss), Net of Tax	(20.4)
Stockholders' Equity Attributable to Parent at Oct. 01, 2020	1,171.5
Common Stock, Shares, Outstanding at Oct. 01, 2020			105,660,882
Additional Paid in Capital, Common Stock at Oct. 01, 2020				1,133.2
Treasury Stock, Value at Oct. 01, 2020						(2,456.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Oct. 01, 2020							(129.6)
Retained Earnings (Accumulated Deficit) at Oct. 01, 2020					2,623.5
Common Stock, Value, Outstanding at Oct. 01, 2020			$ 1.1
Stockholders' Equity Attributable to Parent at Jul. 02, 2020	1,269.0
Common Stock, Shares, Outstanding at Jul. 02, 2020			105,624,828
Additional Paid in Capital, Common Stock at Jul. 02, 2020				1,125.9
Treasury Stock, Value at Jul. 02, 2020						(2,456.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Jul. 02, 2020							(181.3)
Retained Earnings (Accumulated Deficit) at Jul. 02, 2020					2,780.0
Net Income (Loss) Attributable to Parent	(155.5)				(155.5)
Dividends, Common Stock, Cash	(1.0)				(1.0)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			7,657
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture			$ 0.0
Stock Issued During Period, Value, Restricted Stock Award, Gross	6.3			6.3
Shares Issued, Shares, Share-based Payment Arrangement, Forfeited			(30,906)
Shares Granted, Value, Share-based Payment Arrangement, Forfeited			$ 0.0
Payment, Tax Withholding, Share-based Payment Arrangement	(0.3)		$ 0.0	(0.3)
Stock Issued During Period, Shares, Employee Stock Purchase Plans			68,810
Stock Issued During Period, Value, Employee Stock Purchase Plan	1.3			1.3
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			(9,507)
Other Comprehensive Income (Loss), Net of Tax	51.7						51.7
Stockholders' Equity Attributable to Parent at Oct. 01, 2020	1,171.5
Common Stock, Shares, Outstanding at Oct. 01, 2020			105,660,882
Additional Paid in Capital, Common Stock at Oct. 01, 2020				1,133.2
Treasury Stock, Value at Oct. 01, 2020						(2,456.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Oct. 01, 2020							(129.6)
Retained Earnings (Accumulated Deficit) at Oct. 01, 2020					2,623.5
Common Stock, Value, Outstanding at Oct. 01, 2020			$ 1.1
Stockholders' Equity Attributable to Parent at Dec. 31, 2020	856.5
Common Stock, Shares, Outstanding at Dec. 31, 2020			105,542,162
Common Stock, Value, Outstanding at Dec. 31, 2020		$ 1.1	$ 1.1
Additional Paid in Capital, Common Stock at Dec. 31, 2020	1,139.8			1,139.8
Treasury Stock, Value at Dec. 31, 2020	2,456.7					(2,456.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Dec. 31, 2020	(154.1)						(154.1)
Retained Earnings (Accumulated Deficit) at Dec. 31, 2020	2,326.4				2,326.4
Net Income (Loss) Attributable to Parent	(306.9)				(306.9)
Dividends, Common Stock, Cash	(2.2)				(2.2)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			59,538
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture			$ 0.0
Stock Issued During Period, Value, Restricted Stock Award, Gross	13.3			13.3
Shares Issued, Shares, Share-based Payment Arrangement, Forfeited			(105,320)
Shares Granted, Value, Share-based Payment Arrangement, Forfeited			$ 0.0
Payment, Tax Withholding, Share-based Payment Arrangement	(4.4)		$ 0.0	(4.4)
Stock Issued During Period, Shares, Employee Stock Purchase Plans			29,500
Stock Issued During Period, Value, Employee Stock Purchase Plan	1.4			1.4
Supplemental Retirement Plan Shares Issued			9,198
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			(105,238)
Stockholders' Equity, Other	0.1				0.1
Other Comprehensive Income (Loss), Net of Tax	2.0						2.0
Stockholders' Equity Attributable to Parent at Jul. 01, 2021	559.8
Common Stock, Shares, Outstanding at Jul. 01, 2021			105,429,840
Additional Paid in Capital, Common Stock at Jul. 01, 2021				1,150.1
Treasury Stock, Value at Jul. 01, 2021						(2,456.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Jul. 01, 2021							(152.1)
Retained Earnings (Accumulated Deficit) at Jul. 01, 2021					2,017.4
Common Stock, Value, Outstanding at Jul. 01, 2021			$ 1.1
Supplemental Retirement Plan Shares Issued Value	0.0			0.0
Stockholders' Equity Attributable to Parent at Dec. 31, 2020	856.5
Common Stock, Shares, Outstanding at Dec. 31, 2020			105,542,162
Common Stock, Value, Outstanding at Dec. 31, 2020		$ 1.1	$ 1.1
Additional Paid in Capital, Common Stock at Dec. 31, 2020	1,139.8			1,139.8
Treasury Stock, Value at Dec. 31, 2020	2,456.7					(2,456.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Dec. 31, 2020	(154.1)						(154.1)
Retained Earnings (Accumulated Deficit) at Dec. 31, 2020	$ 2,326.4				2,326.4
Common Stock, Dividends, Per Share, Declared	$ 0.03
Net Income (Loss) Attributable to Parent	$ (420.5)
Payment, Tax Withholding, Share-based Payment Arrangement	(5.0)
Other Comprehensive Income (Loss), Net of Tax	(9.2)
Stockholders' Equity Attributable to Parent at Sep. 30, 2021	424.3
Common Stock, Shares, Outstanding at Sep. 30, 2021			105,048,226
Additional Paid in Capital, Common Stock at Sep. 30, 2021	1,140.4			1,140.4
Treasury Stock, Value at Sep. 30, 2021	2,456.7					(2,456.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Sep. 30, 2021	(163.3)						(163.3)
Retained Earnings (Accumulated Deficit) at Sep. 30, 2021	1,902.8				1,902.8
Common Stock, Value, Outstanding at Sep. 30, 2021			$ 1.1
Stockholders' Equity Attributable to Parent at Jul. 01, 2021	$ 559.8
Common Stock, Shares, Outstanding at Jul. 01, 2021			105,429,840
Additional Paid in Capital, Common Stock at Jul. 01, 2021				1,150.1
Treasury Stock, Value at Jul. 01, 2021						(2,456.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Jul. 01, 2021							(152.1)
Retained Earnings (Accumulated Deficit) at Jul. 01, 2021					2,017.4
Common Stock, Dividends, Per Share, Declared	$ 0.01
Net Income (Loss) Attributable to Parent	$ (113.6)				(113.6)
Dividends, Common Stock, Cash	(1.0)				(1.0)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			0
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture			$ 0.0
Stock Issued During Period, Value, Restricted Stock Award, Gross	6.3			6.3
Shares Issued, Shares, Share-based Payment Arrangement, Forfeited			(8,898)
Shares Granted, Value, Share-based Payment Arrangement, Forfeited			$ 0.0
Payment, Tax Withholding, Share-based Payment Arrangement	(0.5)			(0.5)
Stock Issued During Period, Shares, Employee Stock Purchase Plans			37,023
Stock Issued During Period, Value, Employee Stock Purchase Plan	1.6			1.6
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation			(2,923)
Stockholders' Equity, Other	(17.1)				0.0
Other Comprehensive Income (Loss), Net of Tax	(11.2)						(11.2)
Stockholders' Equity Attributable to Parent at Sep. 30, 2021	424.3
Common Stock, Shares, Outstanding at Sep. 30, 2021			105,048,226
Additional Paid in Capital, Common Stock at Sep. 30, 2021	1,140.4			$ 1,140.4
Treasury Stock, Value at Sep. 30, 2021	2,456.7					$ (2,456.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax at Sep. 30, 2021	(163.3)						$ (163.3)
Retained Earnings (Accumulated Deficit) at Sep. 30, 2021	$ 1,902.8				$ 1,902.8
Common Stock, Value, Outstanding at Sep. 30, 2021			$ 1.1