New Accounting Pronouncements - Effects of Adopting ASC 606 (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Condensed Consolidated Statement of Income
Revenues	$ 1,181.4	$ 1,002.4	$ 3,402.2	$ 2,760.3
Cost of goods sold	867.1		2,506.3
Operating income	140.0	134.8	394.4	370.6
Provision for income taxes	25.0	44.5	76.9	115.9
Income from continuing operations	96.9	79.1	269.5	231.7
Net income	99.7	$ 86.3	523.0	$ 250.4
Condensed Consolidated Balance Sheet
Receivables	850.5		850.5		$ 625.7
Inventories, net	489.1		489.1		448.8
Other current assets	56.9		56.9		73.6
Accrued expenses	280.3		280.3		257.8
Other long-term liabilities	269.0		269.0		288.7
Retained earnings	3,287.1		3,287.1		$ 2,820.8
Accounting Standards Update 2014-09
Condensed Consolidated Balance Sheet
Receivables	850.5		850.5
Inventories, net	489.1		489.1
Other current assets	56.9		56.9
Accrued expenses	280.3		280.3
Other long-term liabilities	269.0		269.0
Retained earnings	3,287.1		3,287.1
Balances Without Adoption of ASC 606
Condensed Consolidated Statement of Income
Revenues	1,175.1		3,375.9
Cost of goods sold	862.3		2,487.6
Operating income	138.5		386.8
Provision for income taxes	24.7		75.1
Income from continuing operations	95.7		263.7
Net income	98.5		517.2
Condensed Consolidated Balance Sheet
Receivables	802.0		802.0
Inventories, net	522.5		522.5
Other current assets	56.0		56.0
Accrued expenses	278.5		278.5
Other long-term liabilities	267.0		267.0
Retained earnings	3,280.6		3,280.6
Effect of Change Higher/(Lower) | Accounting Standards Update 2014-09
Condensed Consolidated Statement of Income
Revenues	6.3		26.3
Cost of goods sold	4.8		18.7
Operating income	1.5		7.6
Provision for income taxes	0.3		1.8
Income from continuing operations	1.2		5.8
Net income	1.2		5.8
Condensed Consolidated Balance Sheet
Receivables	48.5		48.5
Inventories, net	(33.4)		(33.4)
Other current assets	0.9		0.9
Accrued expenses	1.8		1.8
Other long-term liabilities	2.0		2.0
Retained earnings	$ 6.5		$ 6.5