Other Commitments And Contingencies (Existence And Expiration Of Commercial Commitments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Other Commitments And Contingencies [Line Items]
Guarantee Obligations Maximum Exposure Year One	$ 1,370.5
Guarantee Obligations Maximum Exposure Year Two	283.2
Guarantee Obligations Maximum Exposure Year Three	616.5
Guarantee Obligations Maximum Exposure Year Four	507.0
Guarantee Obligations Maximum Exposure Year Five	800.0
Guarantee Obligations Maximum Exposure Thereafter	5,118.7
Guarantor Obligations, Maximum Exposure, Undiscounted	8,695.9
Subsidiaries Debt [Member]
Other Commitments And Contingencies [Line Items]
Guarantee Obligations Maximum Exposure Year One	500.0
Guarantee Obligations Maximum Exposure Year Two	230.0
Guarantee Obligations Maximum Exposure Year Three	616.5
Guarantee Obligations Maximum Exposure Year Four	507.0
Guarantee Obligations Maximum Exposure Year Five	800.0
Guarantee Obligations Maximum Exposure Thereafter	5,057.0
Guarantor Obligations, Maximum Exposure, Undiscounted	7,710.5
Letters Of Credit [Member]
Other Commitments And Contingencies [Line Items]
Guarantee Obligations Maximum Exposure Year One	12.6
Guarantee Obligations Maximum Exposure Year Two	17.9
Guarantee Obligations Maximum Exposure Year Three	0
Guarantee Obligations Maximum Exposure Year Four	0
Guarantee Obligations Maximum Exposure Year Five	0
Guarantee Obligations Maximum Exposure Thereafter	0
Guarantor Obligations, Maximum Exposure, Undiscounted	30.5
Accounts Receivable Securitization [Member]
Other Commitments And Contingencies [Line Items]
Guarantee Obligations Maximum Exposure Year One	515.0
Guarantee Obligations Maximum Exposure Year Two	0
Guarantee Obligations Maximum Exposure Year Three	0
Guarantee Obligations Maximum Exposure Year Four	0
Guarantee Obligations Maximum Exposure Year Five	0
Guarantee Obligations Maximum Exposure Thereafter	0
Guarantor Obligations, Maximum Exposure, Undiscounted	515.0
Lines Of Credit [Member]
Other Commitments And Contingencies [Line Items]
Guarantee Obligations Maximum Exposure Year One	297.5
Guarantee Obligations Maximum Exposure Year Two	0
Guarantee Obligations Maximum Exposure Year Three	0
Guarantee Obligations Maximum Exposure Year Four	0
Guarantee Obligations Maximum Exposure Year Five	0
Guarantee Obligations Maximum Exposure Thereafter	0
Guarantor Obligations, Maximum Exposure, Undiscounted	297.5
Other Guarantees [Member]
Other Commitments And Contingencies [Line Items]
Guarantee Obligations Maximum Exposure Year One	45.4
Guarantee Obligations Maximum Exposure Year Two	35.3
Guarantee Obligations Maximum Exposure Year Three	0
Guarantee Obligations Maximum Exposure Year Four	0
Guarantee Obligations Maximum Exposure Year Five	0
Guarantee Obligations Maximum Exposure Thereafter	61.7
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 142.4