Debt (Tables)

12 Months Ended

Dec. 31, 2014

Debt Table

Debt at December 31 consisted of:

	2014				2013
(millions)	Carrying Value		Fair Value		Carrying Value		Fair Value
3.75% Senior Notes due 2021 (issued: $500.0, August 2011)	$	497.8	$	535.6	$	497.6	$	509.1
6 5/8% Senior Notes due 2029 (issued: $300.0, March 1999)	295.5		400.6		295.3		359.6
6.25% Senior Notes due 2032 (issued: $400.0, November 2002)	394.8		527.9		394.6		473.7
4.35% Senior Notes due 2044 (issued: $350.0, April 2014)	346.3		378.9		0		0
6.70% Fixed-to-Floating Rate Junior Subordinated Debentures due 2067 (issued: $1,000.0, June 2007; outstanding: $632.8 and $677.1)	630.3		684.5		673.4		731.3
Total	$	2,164.7	$	2,527.5	$	1,860.9	$	2,073.7

Aggregate Principal Payments on Debt Outstanding

Aggregate required principal payments on debt outstanding are as follows:

(millions)
Year	Payments
2015	$	0
2016	0
2017	0
2018	0
2019	0
Thereafter	2,182.8
Total	$	2,182.8

Cash Flow Hedging

Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges Included in Accumulated Other Comprehensive Income

The original unrealized gain (loss) at the time of each debt issuance and the unamortized balance at December 31, 2014, on a pretax basis, of these hedges, were as follows:

(millions)	Unrealized Gain (Loss) at Debt Issuance			Unamortized Balance at December 31, 2014
3.75% Senior Notes	$	(5.1	)	$	(3.6	)
6 5/8% Senior Notes	(4.2		)	(3.2		)
6.25% Senior Notes	5.1			4.0
4.35% Senior Notes	(1.6		)	(1.6		)
6.70% Debentures	34.4			6.6