Consolidated Statements of Income and Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Income Statement [Abstract]
Net sales	$ 1,425.7		$ 1,431.3
Cost of sales	(1,148.7)		(1,129.9)
Gross profit	277.0		301.4
Selling, general, and administrative expenses	(117.3)		(116.5)
Other expense, net	(2.6)		(24.0)
Income from operations	157.1		160.9
Interest expense, net	(19.2)	[1]	(20.8)	[1]
Income before taxes	137.9		140.1
Income tax provision	(47.1)		(50.0)
Net income	90.8		90.1
Net income per common share:
Basic (in dollars per share)	$ 0.92		$ 0.92
Diluted (in dollars per share)	$ 0.92		$ 0.92
Dividends declared per common share	$ 0.55		$ 0.40
Statements of Comprehensive Income:
Net income	90.8		90.1
Foreign currency translation adjustment	(1.4)		0
Reclassification adjustments to cash flow hedges included in net income, net of tax of $0.6 million and $0.6 million	0.8		0.8
Amortization of pension and postretirement plans actuarial loss and prior service cost, net of tax of $1.4 million and $0.8 million	2.2		1.0
Other comprehensive income	1.6		1.8
Comprehensive income	$ 92.4		$ 91.9

[1] During the three months ended March 31, 2015 and 2014, we received an interest rebate on a portion of our bank debt, reducing our interest expense $4.1 million and $0.8 million, respectively.