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Financial Instruments (Realized Gains and Losses) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value Disclosures [Abstract]    
Proceeds from sales $ 93.7 $ 592.6
Realized gross gains on sales 2.5 2.1
Realized gross losses on sales $ 0.4 $ 1.6