Long-Term Debt And Notes Payable (Capitalization Of Long-Term Debt) (Details) $ in Millions	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Debt Disclosure [Abstract]
Short-term borrowings	$ 49.6	$ 100.8
Long-term debt	749.3	749.2
Total indebtedness	798.9
Total shareholders' equity	1,139.4	$ 1,059.8
Capitalization	$ 1,938.3
Total indebtedness to capitalization	0.41