Fair Value Of Financial Instruments Schedule of Fair Value Assets and Liabilities measured on a Recurring Basis (Details) - Fair Value, Inputs, Level 2 - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Fair Value Disclosure	$ 1,017.0	$ 951.5
Foreign currency contracts, assets	21.6	25.1
Foreign currency contracts, liabilities	$ 20.0	$ 25.4