Revenue Recognition (Impact of Adoption on Consolidated Balance Sheet and Consolidated Statement of Operations) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts and notes receivable, net	$ 528.5		$ 514.8	$ 506.5
Accounts Payable, Current	405.6		357.9	348.6
Retained Earnings (Accumulated Deficit)	1,609.6		1,574.9	1,575.9
Revenue, Net	834.8	$ 793.4
Net income	37.9	$ 43.5
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	6.7		$ 8.3
Accounts Payable, Current	8.3
Retained Earnings (Accumulated Deficit)	(1.6)			$ (1.0)
Revenue, Net	(0.1)
Net income	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	521.8
Accounts Payable, Current	397.3
Retained Earnings (Accumulated Deficit)	1,611.2
Revenue, Net	834.9
Net income	$ 37.9