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Selected Quarterly Data - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Mar. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Debt agreement termination costs				$ 8.7fss_DebtAgreementTerminationCosts	$ 8.7fss_DebtAgreementTerminationCosts
Decrease in valuation allowance	(3.5)	(6.7)	(102.4)
Severance costs		$ 1.2us-gaap_SeveranceCosts1	$ 0.6us-gaap_SeveranceCosts1

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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