Income Taxes Reconcilation of Income Tax Rate (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011		Sep. 30, 2012	Sep. 30, 2011
Amount [Abstract]
Tax provision at U.S. statutory rate	$ 15.1	$ 3.2		$ 35.4	$ 23.2
Tax benefits of foreign legal structure	(0.3)	(0.1)	[1]	(1.0)	(0.7)	[1]
Foreign tax incentives	0	(2.0)	[1]	0	(2.0)	[1]
Adjustments to valuation allowances	1.7	0	[1]	4.5	0	[1]
French business tax reclassified as income tax	0.5	0.5	[1]	1.8	1.8	[1]
Change in enacted foreign tax rate	0.3	0	[1]	0.9	0	[1]
Foreign income tax rate differential	(1.5)	(0.8)	[1]	(3.7)	(0.5)	[1]
Other foreign taxes, net	1.6	0.3	[1]	2.5	1.4	[1]
Other, net	(0.7)	(0.2)	[1]	(0.5)	0.2	[1]
Provision for income taxes	$ 16.7	$ 0.9		$ 39.9	$ 23.4
Percent [Abstract]
Tax provision at U.S. statutory rate	35.00%	35.00%		35.00%	35.00%
Tax benefits of foreign legal structure	(0.70%)	(1.10%)	[1]	(1.00%)	(1.00%)	[1]
Foreign tax incentives	0.00%	(22.20%)	[1]	0.00%	(3.00%)	[1]
Adjustments to valuation allowances	4.00%	0.00%	[1]	4.50%	0.00%	[1]
French business tax reclassified as income tax	1.10%	5.60%	[1]	1.80%	2.70%	[1]
Change in enacted foreign tax rate	0.70%	0.00%	[1]	0.90%	0.00%	[1]
Foreign income tax rate differential	(3.50%)	(8.80%)	[1]	(3.70%)	(0.80%)	[1]
Other foreign taxes, net	3.70%	3.40%	[1]	2.50%	2.10%	[1]
Other, net	(1.60%)	(1.90%)	[1]	(0.50%)	0.20%	[1]
Provision for income taxes	38.70%	10.00%		39.50%	35.20%

[1] * Certain prior-period amounts have been reclassified to conform to current period presentation.