Segment information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Segment Revenue and Operating Profit [Line Items]
Revenues	$ 991.6	$ 950.5
Operating profit	(72.5)	17.3
Capital expenditures	24.3	33.4
Depreciation and amortization	43.6	42.1
Total assets	2,349.4		2,498.0
Assets Net			120.4
Unconsolidated Equity Affiliates held by International Segment [Abstract]
Carrying value of investments at year end	66.6
Latin America [Member]
Segment Revenue and Operating Profit [Line Items]
Revenues	438.4	412.9
Operating profit	(74.8)	23.4
Europe, Middle East and Africa [Member]
Segment Revenue and Operating Profit [Line Items]
Revenues	298.0	277.8
Operating profit	14.8	8.6
North America [Member]
Segment Revenue and Operating Profit [Line Items]
Revenues	220.1	223.2
Operating profit	1.1	(2.0)
Asia Pacific [Member]
Segment Revenue and Operating Profit [Line Items]
Revenues	35.1	36.6
Operating profit	4.4	4.3
Segment operating profit [Member]
Segment Revenue and Operating Profit [Line Items]
Operating profit	(54.5)	34.3
Non Segment [Member]
Segment Revenue and Operating Profit [Line Items]
Operating profit	$ (18.0)	$ (17.0)