Industry Segments and Geographic Area Information Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Sales:
Net sales	$ 854.2	$ 907.4	$ 908.8	$ 834.8	$ 829.7	$ 877.0	$ 874.0	$ 809.7	$ 3,505.2	$ 3,390.4	$ 3,359.4
Operating Income:
Operating Income									477.8	474.6	517.4
Long-lived Assets:
Long-Lived Assets	1,963.0				1,814.8				1,963.0	1,814.8	1,692.2
Operating Segments | United States
Net Sales:
Net sales									3,147.4	3,008.4	2,883.8
Operating Income:
Operating Income									419.1	426.1	447.2
Long-lived Assets:
Long-Lived Assets	1,762.9				1,627.7				1,762.9	1,627.7	1,492.5
Operating Segments | International
Net Sales:
Net sales									357.8	382.0	475.6
Operating Income:
Operating Income									58.7	48.5	70.2
Long-lived Assets:
Long-Lived Assets	$ 200.1				$ 187.1				$ 200.1	$ 187.1	$ 199.7