Quarterly Financial Information (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	$ 982.7	$ 1,018.3	$ 1,030.3	$ 1,040.1	$ 1,052.7	$ 1,098.2	$ 1,097.6	$ 1,095.0	$ 4,071.4	$ 4,343.5	$ 4,476.6
Gross profit	212.9	221.8	221.2	217.5	208.5	220.7	219.0	210.9	873.4	859.1	875.4
Income from continuing operations	56.8	62.5	65.6	57.0	57.2	61.5	60.7	59.7	241.9	239.1	192.5
Income (loss) from discontinued operations, net of tax	0.0	0.0	0.0	(2.6)	1.9	(44.5)	5.1	(10.5)	(2.6)	(48.0)	20.1
Net income	$ 56.8	$ 62.5	$ 65.6	$ 54.4	$ 59.1	$ 17.0	$ 65.8	$ 49.2	$ 239.3	$ 191.1	$ 212.6
Income from continuing operations, per basic share	$ 0.59	$ 0.65	$ 0.68	$ 0.58	$ 0.58	$ 0.62	$ 0.61	$ 0.58	$ 2.50	$ 2.39	$ 1.86
Income (loss) from discontinued operations, per basic share	0.00	0.00	0.00	(0.03)	0.02	(0.45)	0.05	(0.10)	(0.03)	(0.48)	0.20
Net income, per basic share	0.59	0.65	0.68	0.55	0.60	0.17	0.66	0.48	2.47	1.91	2.06
Income from continuing operations, per diluted share	0.58	0.64	0.67	0.58	0.57	0.61	0.60	0.58	2.47	2.36	1.85
Income (loss) from discontinued operations, per diluted share	0.00	0.00	0.00	(0.03)	0.02	(0.44)	0.05	(0.10)	(0.03)	(0.47)	0.19
Net income, per diluted share	$ 0.58	$ 0.64	$ 0.67	$ 0.55	$ 0.59	$ 0.17	$ 0.65	$ 0.48	$ 2.44	$ 1.89	$ 2.04