Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Securities Purchased under Agreements to Resell

($ In Millions)	2015			2014
Balance at December 31	$	1,600.0		$	1,000.0
Average Balance During the Year	1,144.7			742.1
Average Interest Rate Earned During the Year	0.54		%	0.45		%
Maximum Month-End Balance During the Year	1,600.0			1,000.0

Securities Sold under Agreements to Repurchase

($ In Millions)	2015			2014
Balance at December 31	$	546.6		$	885.1
Average Balance During the Year	649.5			989.6
Average Interest Rate Paid During the Year	0.05		%	0.04		%
Maximum Month-End Balance During the Year	802.4			1,038.1