Business, Basis of Presentation and Significant Accounting Policies - Assumptions (Details)	12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]
Long-term equity return assumption	9.00%
Long-term equity return assumption, cap	14.00%
Long-term equity return assumption, look-forward period	5 years

Market Performance, Long-Term Equity Return Assumption, Expected Term

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