Accumulated Other Comprehensive Loss (Changes in AOCI by Component) (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
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 2,349.5	$ 2,229.7	$ 2,055.9	$ 1,947.3	$ 2,229.7	$ 1,947.3
Other comprehensive income before reclassifications	(4.1)		(56.7)		16.1	(42.1)
Amounts reclassified from AOCI	5.7		(0.4)		8.9	4.9
Other comprehensive income (loss)	1.6	23.4	(57.1)	19.9	25.0	(37.2)
Reclassification of income tax effects for ASU 2018-02			47.6
Ending balance	2,473.0	2,349.5	2,102.8	2,055.9	2,473.0	2,102.8
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(164.5)	(181.5)	(84.8)	(102.0)	(181.5)	(102.0)
Other comprehensive income before reclassifications	(4.6)		(59.3)		12.4	(42.1)
Amounts reclassified from AOCI	0.0		0.0		0.0	0.0
Other comprehensive income (loss)	(4.6)		(59.3)		12.4	(42.1)
Ending balance	(169.1)	(164.5)	(144.1)	(84.8)	(169.1)	(144.1)
Cash Flow Hedges and Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(3.1)	(4.9)			(4.9)
Other comprehensive income before reclassifications	0.5				3.7
Amounts reclassified from AOCI	0.8				(0.6)
Other comprehensive income (loss)	1.3				3.1
Ending balance	(1.8)	(3.1)			(1.8)
Cash Flow Hedges and Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(1.1)	0.5		0.5
Other comprehensive income before reclassifications			2.6			0.0
Amounts reclassified from AOCI			(5.5)			(4.5)
Other comprehensive income (loss)			(2.9)			(4.5)
Ending balance			(4.0)	(1.1)		(4.0)
Pension and Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(302.2)	(306.8)	(271.1)	(227.8)	(306.8)	(227.8)
Other comprehensive income before reclassifications	0.0		0.0		0.0	0.0
Amounts reclassified from AOCI	4.9		5.1		9.5	9.4
Other comprehensive income (loss)	4.9		5.1		9.5	9.4
Reclassification of income tax effects for ASU 2018-02						(47.6)
Ending balance	(297.3)	(302.2)	(266.0)	(271.1)	(297.3)	(266.0)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(469.8)	(493.2)	(357.0)	(329.3)	(493.2)	(329.3)
Other comprehensive income (loss)	1.6	23.4	(57.1)	19.9
Reclassification of income tax effects for ASU 2018-02						(47.6)
Ending balance	$ (468.2)	$ (469.8)	$ (414.1)	$ (357.0)	$ (468.2)	$ (414.1)