Information on Business Segments (Property, Plant and Equipment by Country) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Property, plant and equipment, net	[1]	$ 278.5	$ 198.4
Reportable Geographical Components [Member] | U.S.
Segment Reporting Information [Line Items]
Property, plant and equipment, net		102.3	103.0
Reportable Geographical Components [Member] | Brazil
Segment Reporting Information [Line Items]
Property, plant and equipment, net		35.6	36.8
Reportable Geographical Components [Member] | U.K.
Segment Reporting Information [Line Items]
Property, plant and equipment, net		30.5	30.3
Reportable Geographical Components [Member] | Poland
Segment Reporting Information [Line Items]
Property, plant and equipment, net		26.8	0.0
Reportable Geographical Components [Member] | Germany
Segment Reporting Information [Line Items]
Property, plant and equipment, net		21.2	0.0
Reportable Geographical Components [Member] | Australia
Segment Reporting Information [Line Items]
Property, plant and equipment, net		14.7	12.5
Reportable Geographical Components [Member] | Other countries
Segment Reporting Information [Line Items]
Property, plant and equipment, net		$ 47.4	$ 15.8

[1] Net property, plant and equipment as of December 31, 2017 and 2016 contained $42.1 million and $34.7 million of computer software assets, respectively, which are classified within machinery and equipment and construction in progress. Amortization expense for software was $7.1 million, $7.0 million and $6.1 million for the years ended December 31, 2017, 2016 and 2015, respectively.