Reconcilation of Income Tax Rate (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Amount [Abstract]
Tax provision at U.S. statutory rate	$ 11.0	$ 14.8	$ 22.3	$ 29.7
Foreign income tax rate differential	(4.7)	(2.0)	(7.0)	(3.8)
Tax effects of foreign legal structure	0	(0.4)	0.3	(0.7)
Adjustments to valuation allowances	0.9	0	0.9	0
French business tax classified as income tax	0.6	0.5	1.1	1.1
Other foreign taxes, net	(0.6)	0.8	(1.0)	0
Other, net	(0.7)	0.1	(0.3)	(0.1)
Provision for income taxes	$ 6.5	$ 13.8	$ 16.3	$ 26.2
Percent [Abstract]
Tax provision at U.S. statutory rate	35.00%	35.00%	35.00%	35.00%
Foreign income tax rate differential	(15.00%)	(4.70%)	(11.00%)	(4.50%)
Tax effects of foreign legal structure	0.00%	(1.00%)	0.50%	(0.80%)
Adjustments to valuation allowances	2.90%	0.00%	1.40%	0.00%
French business tax classified as income tax	1.90%	1.10%	1.70%	1.30%
Other foreign taxes, net	(1.90%)	1.80%	(1.50%)	0.00%
Other, net	(2.10%)	0.20%	(0.50%)	(0.10%)
Provision for income taxes	20.80%	32.40%	25.60%	30.90%