Accumulated Other Comprehensive Loss (Changes in AOCI by Component) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017	Jul. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Reclassification of income tax effects for ASU 2018-02	$ (47.6)		$ (47.6)		$ (47.6)
Other comprehensive income/(loss) before reclassifications	1.7	$ 37.4	(40.5)	$ 90.1
Amounts reclassified from AOCI	4.8	4.5	9.8	16.3
Other comprehensive income (loss)	6.5	41.9	(30.7)	106.4
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(144.1)	(144.0)	(102.0)	(198.8)
Reclassification of income tax effects for ASU 2018-02					0.0
Other comprehensive income/(loss) before reclassifications	(0.8)	36.8	(42.9)	91.6
Amounts reclassified from AOCI	0.0	0.0	0.0	0.0
Other comprehensive income (loss)	(0.8)	36.8	(42.9)	91.6
Ending balance	(144.9)	(107.2)	(144.9)	(107.2)
Cash Flow Hedges and Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(4.0)	0.1	0.5	(2.8)
Reclassification of income tax effects for ASU 2018-02					0.0
Other comprehensive income/(loss) before reclassifications	2.5	0.6	2.4	(1.5)
Amounts reclassified from AOCI	0.0	1.3	(4.4)	6.3
Other comprehensive income (loss)	2.5	1.9	(2.0)	4.8
Ending balance	(1.5)	2.0	(1.5)	2.0
Pension and Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(218.4)	(242.8)	(227.8)	(249.6)
Reclassification of income tax effects for ASU 2018-02					$ (47.6)
Other comprehensive income/(loss) before reclassifications	0.0	0.0	0.0	0.0
Amounts reclassified from AOCI	4.8	3.2	14.2	10.0
Other comprehensive income (loss)	4.8	3.2	14.2	10.0
Ending balance	(261.2)	(239.6)	(261.2)	(239.6)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(366.5)	(386.7)	(329.3)	(451.2)
Ending balance	$ (407.6)	$ (344.8)	$ (407.6)	$ (344.8)