Debt and Credit Facilities (Short-Term Borrowings and Current Maturities of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Short-term borrowings and current maturities of long-term debt	$ 650.5	$ 350.6
Debentures With Put Feature [Member]
Short-term Debt [Line Items]
Short-term borrowings and current maturities of long-term debt		343.0
Other Current Maturities of Long Term Debt [Member]
Short-term Debt [Line Items]
Short-term borrowings and current maturities of long-term debt	$ 7.7	7.6
Two Point Six Two Five Percent Senior Notes Due Two Thousand Twenty [Member]
Short-term Debt [Line Items]
Debt instrument, interest rate	2.625%
Short-term borrowings and current maturities of long-term debt	$ 299.8	$ 0.0