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Borrowings - Covenants (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Debt Instrument [Line Items]  
Debt Instrument, Covenant Compliance, Consolidated Tangible Net Worth $ 630.0
Debt Instrument, Covenant Compliance, Percent of Quarterly Net Income 65.00%
Debt Instrument, Covenant Compliance, Consolidated Tangible Net Worth at Period End $ 874.2