Comprehensive Income, Accumulated Other Comprehensive Loss, Net of Related Tax (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jul. 01, 2018	Apr. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Dec. 31, 2018
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period	[1]		$ 1,353.5			$ 1,353.5
Total other comprehensive loss, net of tax		$ (20.3)	2.4	$ (53.9)	$ 18.7	(17.9)	$ (35.1)
Balance at end of period	[2]	1,390.9				1,390.9
ASU 2018-02 [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Cumulative effect of accounting change								$ 0.0
Retained Earnings [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Total other comprehensive loss, net of tax		0.0	0.0	0.0	0.0
Retained Earnings [Member] | ASU 2018-02 [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Cumulative effect of accounting change		10.9				10.9		10.9
Accumulated Other Comprehensive Income (Loss) [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period			(233.7)			(233.7)
Other comprehensive loss before reclassifications						(21.5)
Amounts reclassified from AOCI						3.3
Total other comprehensive loss, net of tax		(20.1)	1.9	$ (52.3)	$ 18.2	(18.2)
Balance at end of period		(262.8)				(262.8)
Accumulated Other Comprehensive Income (Loss) [Member] | ASU 2018-02 [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Cumulative effect of accounting change		(10.9)				(10.9)		(10.9)
Foreign Currency Translation Adjustment [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period			(170.1)			(170.1)
Other comprehensive loss before reclassifications						(19.5)
Amounts reclassified from AOCI						0.0
Total other comprehensive loss, net of tax						(19.5)
Balance at end of period		(189.6)				(189.6)
Foreign Currency Translation Adjustment [Member] | ASU 2018-02 [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Cumulative effect of accounting change								0.0
Unrecognized Pension Costs [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period			(69.7)			(69.7)
Other comprehensive loss before reclassifications						0.0
Amounts reclassified from AOCI						3.3
Total other comprehensive loss, net of tax						3.3
Balance at end of period		(76.8)				(76.8)
Unrecognized Pension Costs [Member] | ASU 2018-02 [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Cumulative effect of accounting change								(10.4)
Net Gain (Loss) on Derivative Instruments [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period			$ 6.1			6.1
Other comprehensive loss before reclassifications						(2.0)
Amounts reclassified from AOCI						0.0
Total other comprehensive loss, net of tax						(2.0)
Balance at end of period		$ 3.6				$ 3.6
Net Gain (Loss) on Derivative Instruments [Member] | ASU 2018-02 [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Cumulative effect of accounting change								$ (0.5)

[1] Condensed from audited financial statements

[2] Unaudited