Other Liabilities (Components Of Other Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Accrued expenses and accounts payable	$ 584.8	$ 580.4
Current and deferred taxes payable	204.3	250.6
Fair value of derivative financial instruments, and other	87.5	69.0
Accrued interest payable	86.6	181.2
Other	473.9	816.4
Total other liabilities	1,437.1	1,897.6
Unsettled investment security purchased	$ 0.0	$ 201.2