Income Taxes - Operating Loss Carryforwards (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards	$ 175.0
Expiration date	2024
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards	121.0	71.2
Operating loss carryforwards subject to expiration	51.5
Operating loss carryforwards not subject to expiration	69.5
Expiration date	2013 through 2032
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Loss carryforwards	$ 133.8	$ 160.9
Expiration date	between 2013 and 2032