Fair Value (Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities held in Rabbi Trust	$ 17.2	$ 25.6
Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amounts payable to the plan participants classified as other liabilities	11.0	19.0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	9.3	0.9
Equity securities	9.8	18.0
Total Assets	19.1	18.9
Derivative liabilities	2.9	12.3
Total liabilities	2.9	12.3
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0.0	0.0
Equity securities	9.8	18.0
Total Assets	9.8	18.0
Derivative liabilities	0.0	0.0
Total liabilities	0.0	0.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	9.3	0.9
Equity securities	0.0	0.0
Total Assets	9.3	0.9
Derivative liabilities	2.9	12.3
Total liabilities	2.9	12.3
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0.0	0.0
Equity securities	0.0	0.0
Total Assets	0.0	0.0
Derivative liabilities	0.0	0.0
Total liabilities	$ 0.0	$ 0.0