Significant Accounting Policies Revenue From Contracts with Customers ASU 2014-09 (Details) - Accounting Standards Update 2014-09 [Member] $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Increase (Decrease)	$ 69.4
Inventories [Member]
Summary Of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Increase (Decrease)	(56.6)
Accrued Liabilities [Member]
Summary Of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Increase (Decrease)	0.9
Long Term Deferred Income Tax Liabilities
Summary Of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Increase (Decrease)	2.8
Retained Earnings
Summary Of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Increase (Decrease)	$ 9.1