Debt and Credit Facilities (Short-Term Borrowings and Current Maturities of Long-Term Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Short-term borrowings and current maturities of long-term debt	$ 361.3	$ 360.8
Debentures With Put Feature [Member]
Short-term borrowings and current maturities of long-term debt	343.0	343.0
Current Maturities Of Long Term Debt [Member]
Short-term borrowings and current maturities of long-term debt	7.7	7.7
Other Short Term Borrowings [Member]
Short-term borrowings and current maturities of long-term debt	$ 10.6	$ 10.1