New Accounting Standards New Accounting Standards (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Sales [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement - estimated percentage impact		5.00%
Operating Income (Loss) [Member] | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 7.9	$ 2.1
Minimum [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ (35.0)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Deferred Taxes			10.0
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Prepaids and Other Assets			50.0
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Inventories			35.0
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Other Accrued Liabilities			35.0
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets, pre-tax			(50.0)
Minimum [Member] | Gross margin [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement - estimated percentage impact	(3.00%)
Minimum [Member] | Operating margin [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement - estimated percentage impact		(0.10%)
Maximum [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			(45.0)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Deferred Taxes			20.0
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Prepaids and Other Assets			60.0
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Inventories			45.0
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Other Accrued Liabilities			45.0
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets, pre-tax			$ (60.0)
Maximum [Member] | Gross margin [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement - estimated percentage impact		(4.50%)
Maximum [Member] | Operating margin [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement - estimated percentage impact		(0.30%)