Basis of Presentation Basis of Presentation (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
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in costs of sales	$ 545.6	$ 444.3	$ 1,066.8	$ 873.8
Decrease in inventories	411.5		411.5			$ 349.3
Increase in other current assets	77.1		77.1			$ 19.6
ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract with Customer, Asset, Gross					$ 28.1
Contract with customer asset, net	53.3		53.3		22.1
ASC 606 Deferred Tax Liability					2.3
Contract with customer, asset, reduced inventories					19.1
ASC 606 | Difference between Revenue Guidance in Effect before and after Topic 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in revenues from contracts with customers	6.2		18.6
Increase in costs of sales	2.4		12.1
Decrease in inventories	40.1		40.1
Increase in other current assets	53.3		53.3
ASC 606 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption					$ 6.7
Change resulting from ASU No. 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	$ 5.2	$ 3.3	$ 10.4	$ 6.7