Statements of Consolidated Income (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Income Statement [Abstract]
Net sales	$ 338.0	$ 338.9	$ 344.1	$ 335.1	$ 311.3	$ 319.9	$ 328.9	$ 337.4	$ 1,356.1	$ 1,297.5		$ 1,360.1
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	278.7	280.4	275.5	282.9	254.3	259.5	261.5	263.6	1,117.5	1,038.9		1,116.2
Unrealized losses (gains) on derivative instruments	10.4	3.6	(1.6)	(2.0)	(4.1)	(1.5)	4.2	0.7	10.4	(0.7)		(15.2)
Depreciation and amortization									31.1	28.1		26.5
Selling, administrative, research and development and general									81.4	80.4		74.1
Defined benefit plan, net periodic benefit cost - VEBAs									(23.7)	(22.5)		(11.9)
Total selling, administrative, research and development and general									57.7	57.9		62.2
Other operating charges, net									1.5	0		4.5
Total costs and expenses									1,218.2	1,124.2		1,194.2
Operating income	26.8	32.6	46.4	32.1	41.6	41.6	40.1	50.0	137.9	173.3		165.9
Other (expense) income:
Interest expense									(37.5)	(35.7)		(29.1)
Other income, net (see Note 15)									6.7	5.6		2.8
Income before income taxes									107.1	143.2		139.6
Income tax provision									(35.3)	(38.4)		(53.8)
Net income	$ 15.6	$ 15.9	$ 24.5	$ 15.8	$ 27.3	$ 25.4	$ 18.6	$ 33.5	$ 71.8	$ 104.8		$ 85.8
Net income per common share:
Basic	$ 0.88	$ 0.90	$ 1.38	$ 0.88	$ 1.48	$ 1.37	$ 0.99	$ 1.75	$ 4.02	$ 5.56		$ 4.49
Net income per share	$ 0.85	$ 0.85	$ 1.33	$ 0.85	$ 1.44	$ 1.34	$ 0.98	$ 1.73	$ 3.86	$ 5.44	[1]	$ 4.45	[1]
Weighted-average number of common shares outstanding (in thousands):
Basic									17,818	18,827	[2]	19,115	[2]
Diluted									18,593	19,246	[1]	19,278	[1]

[1] The diluted weighted-average number of common shares outstanding during the periods were calculated using the treasury method.

[2] The basic weighted-average number of common shares outstanding during the period excludes non-vested common shares, restricted stock units and performance shares.