Quarterly Summary and Statistical Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 758.7	$ 790.1	$ 782.1	$ 720.6	$ 804.1	$ 856.4	$ 838.0	$ 744.5	$ 3,051.5	$ 3,243.0	$ 3,060.7
Gross Profit	286.7	311.9	310.6	258.3	274.5	327.8	320.9	269.2	1,167.5	1,192.4	1,142.1
Net income (loss)	$ 20.3	$ 13.8	$ 57.4	$ 52.7	$ 15.5	$ 74.5	$ 136.2	$ 50.1	$ 144.2	$ 276.3	$ 256.1
Basic earnings per share:
Net income (loss) (in dollars per share)	$ 0.29	$ 0.19	$ 0.79	$ 0.72	$ 0.21	$ 1.00	$ 1.79	$ 0.65	$ 2.00	$ 3.67	$ 3.35
Diluted earnings per share:
Net income (loss) (in dollars per share)	0.29	0.19	0.78	0.72	0.21	0.99	1.77	0.64	$ 1.99	$ 3.63	$ 3.30
Market price of common stock:
High (in dollars per share)	101.99	104.94	103.72	104.90	99.55	100.07	102.65	105.05
Low (in dollars per share)	92.66	90.84	95.03	84.25	79.06	90.56	90.40	90.58
Close (in dollars per share)	$ 99.59	$ 93.05	$ 100.30	$ 98.87	$ 95.39	$ 90.94	$ 94.53	$ 99.17