Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Net Sales	$ 1,094.7	$ 1,103.2	$ 2,156.2	$ 2,137.2
Income (Loss) from Operations	87.6	105.6	163.1	212.8
Depreciation and Amortization	75.2	75.2	150.2	145.9
Corporate/Other/Eliminations
Segment Reporting Information [Line Items]
Net Sales	46.4	38.1	77.3	50.3
Income (Loss) from Operations	(1.6)	(5.3)	(10.2)	(19.5)
Depreciation and Amortization	4.4	2.7	8.8	4.9
Paperboard Mills | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	96.9	97.2	195.0	198.3
Income (Loss) from Operations	(10.3)	1.7	(22.6)	0.5
Depreciation and Amortization	31.2	29.6	61.8	60.7
Americas Paperboard Packaging | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	812.7	819.0	1,605.5	1,595.4
Income (Loss) from Operations	90.5	99.9	179.9	213.4
Depreciation and Amortization	29.5	32.4	59.7	59.7
Europe Paperboard Packaging | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	138.7	148.9	278.4	293.2
Income (Loss) from Operations	9.0	9.3	16.0	18.4
Depreciation and Amortization	$ 10.1	$ 10.5	$ 19.9	$ 20.6