Fair Value Measurements (Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Assets:
Available-for-sale securities	$ 177.9	$ 170.1
Available-for-sale securities, fair value	177.9	170.1
Liabilities:
Notes payable and current portion of long-term debt	2,221.0	2,594.8
Long-term debt	9,729.3	9,674.2
Notes payable and current portion of long-term debt, fair value	2,221.0	2,594.8
Long-term debt, fair value	$ 10,170.4	$ 10,095.1