Income Taxes - Net Operating Losses (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Net Operating Losses [Line Items]
2013-2017	$ 6.0
2018-2022	5.9
2023 and thereafter	22.9
Unlimited	28.7
Tax benefit of net operating loss carryforwards before valuation allowances	63.5	44.9
Federal [Member]
Net Operating Losses [Line Items]
2013-2017	0
2018-2022	0
2023 and thereafter	13.0
Unlimited	0
Tax benefit of net operating loss carryforwards before valuation allowances	13.0
State [Member]
Net Operating Losses [Line Items]
2013-2017	0.6
2018-2022	0.1
2023 and thereafter	9.7
Unlimited	0
Tax benefit of net operating loss carryforwards before valuation allowances	10.4
Foreign [Member]
Net Operating Losses [Line Items]
2013-2017	5.4
2018-2022	5.8
2023 and thereafter	0.2
Unlimited	28.7
Tax benefit of net operating loss carryforwards before valuation allowances	$ 40.1