Comprehensive Income (Items Not Reclassified from AOCI to Net Income) (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	$ (27.9)	$ 0.0
Cost of goods sold; Selling, general and administrative expenses			$ (2,772.7)	$ (2,714.4)	$ (2,565.1)
Provision for income taxes			(107.6)	(156.9)	$ (124.1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(30.2)	4.2
Losses on Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			4.7	8.7
Defined Benefit Plan Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(7.0)	(4.5)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(27.9)	0.0	$ (27.9)	$ 0.0
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(30.2)	4.2
Reclassification out of Accumulated Other Comprehensive Income [Member] | Losses on Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	(1.4)	(5.0)
Net of tax	4.7	8.7
Reclassification out of Accumulated Other Comprehensive Income [Member] | Losses on Cash Flow Hedges [Member] | Commodity Derivative Contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold; Selling, general and administrative expenses	6.1	13.7
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plan Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold; Selling, general and administrative expenses	(9.3)	(7.3)
Provision for income taxes	2.3	2.8
Net of tax	$ (7.0)	$ (4.5)