Revenue Recognition (Cumulative Effect on Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts and notes receivable, net	$ 580.9	$ 514.8	$ 506.5
Accounts Payable, Current	371.6	357.9	348.6
Accrued Liabilities, Current	292.5		270.3
Retained Earnings (Accumulated Deficit)	1,805.0	1,574.9	$ 1,575.9
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
Accounts Payable, Current	361.4
Retained Earnings (Accumulated Deficit)	1,806.7
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	8.3
Accounts Payable, Current	10.2
Accrued Liabilities, Current		9.3
Retained Earnings (Accumulated Deficit)	$ (1.7)	$ (1.0)