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Restructuring Charges - Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Restructuring Charges [Abstract]      
Restructuring charges $ 0.6us-gaap_RestructuringCharges $ 0us-gaap_RestructuringCharges $ 9.8us-gaap_RestructuringCharges
Stock-based compensation 3.6us-gaap_ShareBasedCompensation 1.8us-gaap_ShareBasedCompensation 5.6us-gaap_ShareBasedCompensation
Restructuring reserve $ 2.7us-gaap_RestructuringReserve