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Nonoperating Income (Expense) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2016
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Income and Expenses [Abstract]          
Proceeds from sales of marketable equity securities     $ 137.9 $ 264.8 $ 43.0
Increase in other receivables from sale of certain marketable securities     22.0    
Gain on sale of marketable equity securities     73.0 223.0 12.0
Marketable securities, after tax realized gain     $ 46.0 $ 140.0 $ 8.0
Marketable securities, after-tax gain, per diluted share     $ 0.06 $ 0.20 $ 0.01
Payments of debt extinguishment costs $ 188.0 $ 188.0 $ 0.0 $ 188.1 $ 0.0
Loss on early extinguishment of borrowings     $ 0.0 178.8 $ 0.0
Extinguishment of debt, gain (loss), net of tax       $ (112.0)  
Extinguishment of borrowings, (loss), per share, new of tax       $ 0.16