Business Overview and Basis of Presentation Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, beginning of period				$ (145.8)
Amounts reclassified from accumulated other comprehensive income (loss):
Total other comprehensive income (loss), net of income taxes		$ 39.0	$ (24.7)	129.5	$ (11.1)
Equity, end of period		(16.3)		(16.3)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, beginning of period		16.2	62.7	(72.6)	51.2
Other comprehensive income (loss) before reclassifications, net of income taxes		38.1	(25.7)	126.9	(14.2)
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 (loss), net of income taxes		38.1	(25.7)	126.9	(14.2)
Equity, end of period		54.3	37.0	54.3	37.0
Pension & post-retirement plan benefit adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, beginning of period	[1]	(71.5)	(63.5)	(73.2)	(65.6)
Other comprehensive income (loss) before reclassifications, net of income taxes	[1]	0.0	0.0	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)	[1],[2]	1.2	1.3	3.4	4.1
Income tax impact	[1]	(0.3)	(0.3)	(0.8)	(1.0)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	[1]	0.9	1.0	2.6	3.1
Total other comprehensive income (loss), net of income taxes	[1]	0.9	1.0	2.6	3.1
Equity, end of period	[1]	(70.6)	(62.5)	(70.6)	(62.5)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, beginning of period		(55.3)	(0.8)	(145.8)	(14.4)
Other comprehensive income (loss) before reclassifications, net of income taxes		38.1	(25.7)	126.9	(14.2)
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)		1.2	1.3	3.4	4.1
Income tax impact		(0.3)	(0.3)	(0.8)	(1.0)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes		0.9	1.0	2.6	3.1
Total other comprehensive income (loss), net of income taxes		39.0	(24.7)	129.5	(11.1)
Equity, end of period		$ (16.3)	$ (25.5)	$ (16.3)	$ (25.5)

[1] Includes balances relating to non-U.S. employee defined benefit plans, supplemental executive retirement plans and other postretirement employee benefit plans.

[2] This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost (refer to Note 6 for additional details).