Segment Information Segment Information (Narrative) (Details) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($)	Dec. 31, 2017 region	Dec. 31, 2016 USD ($)
Segment Reporting [Abstract]
Legal settlement(1)	$ 27.2		$ 27.2	[1]
Gain (loss) Related to Litigation Settlement, After Tax			$ 27.2
Number of Reportable Segments | region		4

[1] In the third quarter of 2016, we settled claims relating to professional services that had been provided to the Company prior to 2013 in connection with a previously disclosed legal matter. The proceeds, net of legal fees, of $27.2 before tax ($27.2 after tax) were recognized as a reduction of SG&A in the third quarter of 2016 and were subsequently received by the Company in the fourth quarter of 2016.