Severance Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2012
Restructuring Cost and Reserve [Line Items]
Employee seperation charges	$ 8.5	$ 8.5
Headcount Reduction [Member]
Restructuring Cost and Reserve [Line Items]
Employee seperation charges		2.9
Reduction in the number of corporate support staff		150
Executive Severance [Member]
Restructuring Cost and Reserve [Line Items]
Employee seperation charges		5.6
Cash Charge [Member] \| Executive Severance [Member]
Restructuring Cost and Reserve [Line Items]
Employee seperation charges		4.0
Accelerated Vesting Of Stock Awards [Member] \| Executive Severance [Member]
Restructuring Cost and Reserve [Line Items]
Employee seperation charges		$ 1.6

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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+ Details