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Summary of Significant Accounting Policies - Self Insurance (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	May 31, 2011
Accounting Policies [Abstract]
Workers' Compensation Liability	$ 8.0
Unearned Premiums	1.9
Letters of Credit Outstanding, Amount	5.4	5.9
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount	$ 2.0

Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement.

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- Definition

Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date.

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