Revenue Recognition (Impact of Adoption on Consolidated Balance Sheet and Consolidated Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts and notes receivable, net	$ 741.3		$ 741.3		$ 514.8	$ 506.5
Accounts Payable, Current	437.5		437.5		357.9	348.6
Retained Earnings (Accumulated Deficit)	1,722.8		1,722.8		1,574.9	$ 1,575.9
Revenue, Net	1,175.4	$ 1,102.1	2,010.2	$ 1,895.6
Cost of Goods and Services Sold	813.8	761.3	1,425.5	1,343.8
Income tax benefit	45.3	50.9	51.4	60.7
Net income	137.6	$ 115.5	175.5	$ 159.0
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts and notes receivable, net	10.8		10.8		8.3
Accounts Payable, Current	13.3		13.3
Retained Earnings (Accumulated Deficit)	(2.5)		(2.5)		$ (1.0)
Revenue, Net	(0.1)		(0.2)
Net income	0.0		0.0
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts and notes receivable, net	730.5		730.5
Accounts Payable, Current	424.2		424.2
Retained Earnings (Accumulated Deficit)	1,725.3		1,725.3
Revenue, Net	1,175.5		2,010.4
Net income	$ 137.6		$ 175.5