Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$ (681.6)	$ (651.3)	$ (1,913.5)	$ (1,876.7)
Income tax expense	(41.7)	(35.1)	(91.9)	(86.6)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications from AOCI	(3.3)	(1.4)	(10.1)	(5.6)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gains/(Losses) on cash flow hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	1.2	0.4	3.2	1.8
Total reclassifications from AOCI	(2.0)	(0.6)	(6.2)	(3.1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	(2.0)	(1.3)	(6.1)	(4.0)
Income tax expense	0.7	0.5	2.2	1.5
Total reclassifications from AOCI	(1.3)	(0.8)	(3.9)	(2.5)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Commodity derivative contracts [Member] | Gains/(Losses) on cash flow hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$ (3.2)	$ (1.0)	$ (9.4)	$ (4.9)