Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2013

Debt Disclosure [Abstract]

Schedule of Debt [Table Text Block]

Great Plains Energy's and KCP&L's long-term debt is detailed in the following table.

		June 30				December 31
	Year Due	2013				2012
KCP&L			(millions)
General Mortgage Bonds
2.95% EIRR bonds(a)	2015-2035		$	146.4			$	106.9
7.15% Series 2009A (8.59% rate)(b)	2019		400.0				400.0
4.65% EIRR Series 2005	2035		50.0				50.0
5.375% Series 2007B			—				73.2
Senior Notes
5.85% Series (5.72% rate)(b)	2017		250.0				250.0
6.375% Series (7.49% rate)(b)	2018		350.0				350.0
3.15% Series	2023		300.0				—
6.05% Series (5.78% rate)(b)	2035		250.0				250.0
5.30% Series	2041		400.0				400.0
EIRR Bonds
0.089% Series 2007A and 2007B(c)	2035		146.5				—
4.90% Series 2008	2038		23.4				23.4
Other			—				2.6
Current maturities			—				(0.4		)
Unamortized discount			(4.2		)		(4.0		)
Total KCP&L excluding current maturities			2,312.1				1,901.7
Other Great Plains Energy
GMO First Mortgage Bonds 9.44% Series	2014-2021		9.0				10.1
GMO Pollution Control Bonds
0.189% Wamego Series 1996(c)	2026		7.3				7.3
0.192% State Environmental 1993(c)	2028		5.0				5.0
5.85% SJLP Pollution Control			—				5.6
GMO 8.27% Senior Notes	2021		80.9				80.9
GMO Medium Term Notes
7.16% Series	2013		6.0				6.0
7.33% Series	2023		3.0				3.0
7.17% Series	2023		7.0				7.0
Great Plains Energy Senior Notes
2.75% Series (3.67% rate)(b)	2013		250.0				250.0
6.875% Series (7.33% rate)(b)	2017		100.0				100.0
4.85% Series (7.34% rate)(b)	2021		350.0				350.0
5.292% Series	2022		287.5				287.5
Current maturities			(257.1		)		(262.7		)
Unamortized discount and premium, net			5.2				5.4
Total Great Plains Energy excluding current maturities			$	3,165.9			$	2,756.8

^(a)  Weighted-average interest rates at June 30, 2013

^(b)  Rate after amortizing gains/losses recognized in OCI on settlements of interest rate hedging instruments

^(c)  Variable rate