Income Taxes - Net Operating Losses (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Net Operating Losses [Line Items]
2012-2016	$ 4.2
2017-2021	6.9
2022 and thereafter	10.8
Unlimited	23.0
Tax benefit of net operating loss carryforwards before valuation allowances	44.9	38.6
Federal [Member]
Net Operating Losses [Line Items]
2012-2016	0
2017-2021	0
2022 and thereafter	0
Unlimited	0
Tax benefit of net operating loss carryforwards before valuation allowances	0
State [Member]
Net Operating Losses [Line Items]
2012-2016	0.5
2017-2021	0.1
2022 and thereafter	8.0
Unlimited	0
Tax benefit of net operating loss carryforwards before valuation allowances	8.6
Foreign [Member]
Net Operating Losses [Line Items]
2012-2016	3.7
2017-2021	6.8
2022 and thereafter	2.8
Unlimited	23.0
Tax benefit of net operating loss carryforwards before valuation allowances	$ 36.3