Equity and Accumulated Other Comprehensive Income (Reclassifications out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
SG&A	$ 416.8	$ 408.9	$ 412.3
Cost of sales	3,411.1	3,451.3	$ 4,082.1
Total	30.3	56.7
Foreign currency translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total	36.0	59.6
Foreign currency translation | Reclassification out of Accumulated Other Comprehensive Income | Closure of subsidiaries
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
SG&A	3.3	27.8
Foreign currency translation | Reclassification out of Accumulated Other Comprehensive Income | Sale of subsidiaries
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
SG&A	32.7	31.8
Defined pension items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
SG&A	(0.4)	0.0
Total	(5.7)	(2.9)
Amortization of prior service cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	(0.3)	(0.6)
Amortization of net loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	(5.0)	(7.0)
Settlement loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ 0.0	$ 4.7