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Long-Term Debt (Narrative 2016 Senior Notes) (Details) - Senior Notes - 2016 Senior Notes - USD ($)
$ in Millions
Mar. 31, 2016
Feb. 19, 2016
Debt Instrument [Line Items]    
Debt instrument, face amount   $ 350.0
Debt instrument, stated interest rate 6.375% 6.375%
Debt issuance costs capitalized   $ 5.5