Business Overview and Basis of Presentation Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, beginning of period				$ (7.6)
Amounts reclassified from accumulated other comprehensive income (loss):
Total other comprehensive income, net of income taxes		$ (99.1)	$ 46.1	(62.0)	$ 90.5
Equity, end of period		(69.6)		(69.6)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, beginning of period		100.4	(29.0)	64.0	(72.6)
Other comprehensive income (loss) before reclassifications, net of income taxes		(99.8)	45.2	(63.4)	88.8
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)		0.0	0.0	0.0	0.0
Income tax impact		0.0	0.0	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes		0.0	0.0	0.0	0.0
Total other comprehensive income, net of income taxes		(99.8)	45.2	(63.4)	88.8
Equity, end of period		0.6	16.2	0.6	16.2
Pension adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, beginning of period		(70.9)	(72.4)	(71.6)	(73.2)
Other comprehensive income (loss) before reclassifications, net of income taxes		0.0	0.0	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)	[1]	0.9	1.1	1.8	2.2
Income tax impact		(0.2)	(0.2)	(0.4)	(0.5)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes		0.7	0.9	1.4	1.7
Total other comprehensive income, net of income taxes		0.7	0.9	1.4	1.7
Equity, end of period		(70.2)	(71.5)	(70.2)	(71.5)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, beginning of period		29.5	(101.4)	(7.6)	(145.8)
Other comprehensive income (loss) before reclassifications, net of income taxes		(99.8)	45.2	(63.4)	88.8
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)		0.9	1.1	1.8	2.2
Income tax impact		(0.2)	(0.2)	(0.4)	(0.5)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes		0.7	0.9	1.4	1.7
Total other comprehensive income, net of income taxes		(99.1)	46.1	(62.0)	90.5
Equity, end of period		$ (69.6)	$ (55.3)	$ (69.6)	$ (55.3)

[1] This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost (refer to Note 7 for additional details).