Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$ (709.1)	$ (698.1)	$ (1,231.9)	$ (1,225.4)
Income tax expense	(42.9)	(40.8)	(50.2)	(51.5)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications from AOCI	(3.0)	(2.6)	(6.6)	(4.1)
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	1.0	1.0	2.3	1.4
Total reclassifications from AOCI	(1.8)	(1.8)	(3.9)	(2.5)
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)	(4.2)	(2.6)
Income tax expense	0.8	0.5	1.5	1.0
Total reclassifications from AOCI	(1.2)	(0.8)	(2.7)	(1.6)
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	$ (2.8)	$ (2.8)	$ (6.2)	$ (3.9)