Condensed Consolidated Statements of Income (Unaudited) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net sales	$ 309.4	$ 308.8	$ 594.5	$ 571.9
Cost of sales	251.3	252.9	484.5	467.1
Gross profit	58.1	55.9	110.0	104.8
Selling, general and administrative expenses	33.3	29.5	62.6	58.3
Settlement of litigation	0	13.0	0	13.0
Operating income	24.8	13.4	47.4	33.5
Interest expense	6.6	6.6	13.1	13.3
Income before income taxes	18.2	6.8	34.3	20.2
Income tax expense	6.2	2.4	12.0	6.8
Net income	$ 12.0	$ 4.4	$ 22.3	$ 13.4
Earnings per common share:
Basic (in dollars per share)	$ 1.01	$ 0.37	$ 1.88	$ 1.13
Diluted (in dollars per share)	$ 0.98	$ 0.37	$ 1.85	$ 1.11
Common shares used in the computation:
Basic (in shares)	11,873,645	11,928,806	11,803,529	11,858,029
Diluted (in shares)	12,203,172	12,112,258	12,112,460	12,076,685