Industry Segments and Geographic Area Information - Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Sales:
Net sales	$ 1,103.3	$ 1,204.0	$ 1,196.4	$ 1,087.3	$ 1,144.1	$ 1,179.7	$ 1,166.7	$ 991.2	$ 4,591.0	$ 4,481.7	$ 3,668.8
Operating Income:
Operating Income									596.6	556.9	518.8
Long-lived Assets:
Long-Lived Assets	3,322.6				3,217.4				3,322.6	3,217.4	2,110.2
United States
Net Sales:
Net sales									4,190.5	4,040.6	3,280.9
Operating Income:
Operating Income									529.7	478.0	435.8
Long-lived Assets:
Long-Lived Assets	2,950.4				2,972.4				2,950.4	2,972.4	1,877.4
International
Net Sales:
Net sales									400.5	441.1	387.9
Operating Income:
Operating Income									66.9	78.9	83.0
Long-lived Assets:
Long-Lived Assets	$ 372.2				$ 245.0				$ 372.2	$ 245.0	$ 232.8