Industry Segments and Geographic Area Information Geographic Area (Details) - USD ($) $ 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
Net Sales:
Net sales	$ 829.7	$ 877.0	$ 874.0	$ 809.7	$ 848.8	$ 895.3	$ 855.8	$ 759.5	$ 3,390.4	$ 3,359.4	$ 3,183.9
Operating Income:
Operating Income									474.6	517.4	507.6
Long-lived Assets:
Long-Lived Assets	1,814.8				1,692.2				1,814.8	1,692.2	1,553.7
Operating Segments | United States
Net Sales:
Net sales									3,008.4	2,883.8	2,687.6
Operating Income:
Operating Income									426.1	447.2	417.5
Long-lived Assets:
Long-Lived Assets	1,627.7				1,492.5				1,627.7	1,492.5	1,341.4
Operating Segments | International
Net Sales:
Net sales									382.0	475.6	496.3
Operating Income:
Operating Income									48.5	70.2	90.1
Long-lived Assets:
Long-Lived Assets	$ 187.1				$ 199.7				$ 187.1	$ 199.7	$ 212.3