Accumulated Other Comprehensive Loss (Changes in AOCI by Component) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive income before reclassifications	$ 37.4	$ (8.5)	$ 90.1	$ 6.1
Amounts reclassified from AOCI	4.5	3.2	16.3	12.9
Other comprehensive income (loss)	41.9	(5.3)	106.4	19.0
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(144.0)	(162.9)	(198.8)	(174.2)
Other comprehensive income before reclassifications	36.8	(7.7)	91.6	3.6
Amounts reclassified from AOCI	0.0	0.0	0.0	0.0
Other comprehensive income (loss)	36.8	(7.7)	91.6	3.6
Ending balance	(107.2)	(170.6)	(107.2)	(170.6)
Cash Flow Hedges and Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	0.1	(1.2)	(2.8)	(6.7)
Other comprehensive income before reclassifications	0.6	(0.8)	(1.5)	2.5
Amounts reclassified from AOCI	1.3	(0.1)	6.3	2.1
Other comprehensive income (loss)	1.9	(0.9)	4.8	4.6
Ending balance	2.0	(2.1)	2.0	(2.1)
Pension and Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(242.8)	(224.8)	(249.6)	(232.3)
Other comprehensive income before reclassifications	0.0	0.0	0.0	0.0
Amounts reclassified from AOCI	3.2	3.3	10.0	10.8
Other comprehensive income (loss)	3.2	3.3	10.0	10.8
Ending balance	(239.6)	(221.5)	(239.6)	(221.5)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(386.7)	(388.9)	(451.2)	(413.2)
Ending balance	$ (344.8)	$ (394.2)	$ (344.8)	$ (394.2)