Accumulated Other Comprehensive Loss (Changes in AOCI by Component) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 2,229.7	$ 1,947.3
Other comprehensive income before reclassifications	20.3	14.5
Amounts reclassified from AOCI	3.1	5.4
Other comprehensive income	23.4	19.9
Cumulative effect of new accounting standards			$ 3.3
Ending balance	2,349.5	2,055.9
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(181.5)	(102.0)
Other comprehensive income before reclassifications	17.0	17.2
Amounts reclassified from AOCI	0.0	0.0
Other comprehensive income	17.0	17.2
Ending balance	(164.5)	(84.8)
Cash Flow Hedges and Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(4.9)	0.5
Other comprehensive income before reclassifications	3.3	(2.7)
Amounts reclassified from AOCI	(1.5)	1.1
Other comprehensive income	1.8	(1.6)
Ending balance	(3.1)	(1.1)
Pension and Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(306.8)	(227.8)
Other comprehensive income before reclassifications	0.0	0.0
Amounts reclassified from AOCI	4.6	4.3
Other comprehensive income	4.6	4.3
Ending balance	(302.2)	(271.1)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(493.2)	(329.3)
Other comprehensive income	23.4	19.9
Cumulative effect of new accounting standards			(47.6)
Ending balance	$ (469.8)	$ (357.0)
Accounting Standards Update 2018-02 | Pension and Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Cumulative effect of new accounting standards			(47.6)
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Cumulative effect of new accounting standards			$ (47.6)