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Short-Term and Long-Term Debt - Short-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
Short-term Debt $ 37.9 $ 104.4
Bank Lines of Credit [Member]    
Lines of Credit [Line Items]    
Maximum Borrowing Capacity 408.4 408.4
Pledged for Standby Letters of Credit 12.4 47.5
Draws $ 1.6 $ 3.7