Debt (Tables)

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Debt Table

Debt consisted of:

	September 30, 2016				September 30, 2015				December 31, 2015
(millions)	Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value
3.75% Senior Notes due 2021	$	498.4	$	544.2	$	498.1	$	534.5	$	498.1	$	528.7
2.45% Senior Notes due 2027	495.6		497.5		0		0		0		0
6 5/8% Senior Notes due 2029	295.8		402.6		295.6		379.5		295.7		376.0
6.25% Senior Notes due 2032	395.1		533.3		394.9		489.3		395.0		490.6
4.35% Senior Notes due 2044	346.4		403.0		346.4		345.7		346.4		352.8
3.70% Senior Notes due 2045	395.1		418.7		395.0		358.0		395.0		362.0
6.70% Fixed-to-Floating Rate Junior Subordinated Debentures due 2067	593.9		572.3		612.6		620.5		612.8		612.8
Other debt instruments	133.6		133.6		171.7		171.7		164.9		164.9
Total	$	3,153.9	$	3,505.2	$	2,714.3	$	2,899.2	$	2,707.9	$	2,887.8

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

The other debt instruments reported in the table above represent ARX indebtedness and consist of:

	September 30, 2016			September 30, 2015			December 31, 2015
Type of debt instrument	Number of Instruments	Carrying Value		Number of Instruments	Carrying Value		Number of Instruments	Carrying Value		Stated Maturity Date(s)
Term loans	2	$	68.4	2	$	93.3	2	$	87.1	December 2018 and 2019
Junior subordinated notes1	2	41.2		2	41.3		2	41.2		June 2036 and 2037
Senior notes	4	24.0		4	24.0		4	24.0		Various2
Surplus note3	0	0		1	13.1		1	12.6		November 2021
Total		$	133.6		$	171.7		$	164.9

¹ ARX issued junior subordinated floating rate notes to trusts established by ARX in connection with issuances of trust preferred securities by the trusts

(discussed below).

² The senior notes mature in May 2033, April 2034, December 2034, and June 2035.

³ The surplus note was debt of the subsidiary disposed of by ARX in the exchange transaction during the second quarter 2016 (see Note 1 – Basis of Presentation for further discussion).