Revenue Recognition (Impact of Adoption on Consolidated Balance Sheet and Consolidated Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts and notes receivable, net	$ 580.9		$ 580.9		$ 514.8	$ 506.5
Accounts Payable, Current	371.6		371.6		357.9	348.6
Retained Earnings (Accumulated Deficit)	1,805.0		1,805.0		1,574.9	$ 1,575.9
Revenue, Net	1,030.2	$ 1,052.3	3,040.4	$ 2,947.9
Cost of Goods and Services Sold	728.3	738.6	2,153.8	2,082.4
Income tax benefit	25.8	43.0	77.3	103.8
Net income	108.0	$ 103.5	283.4	$ 262.5
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	8.5		8.5		8.3
Accounts Payable, Current	10.2		10.2
Retained Earnings (Accumulated Deficit)	(1.7)		(1.7)		$ (1.0)
Revenue, Net	0.0		(0.2)
Net income	(0.1)		(0.1)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts and notes receivable, net	572.4		572.4
Accounts Payable, Current	361.4		361.4
Retained Earnings (Accumulated Deficit)	1,806.7		1,806.7
Revenue, Net	1,030.2		3,040.6
Net income	$ 108.1		$ 283.5