STATEMENTS OF COMMON SHAREHOLDERS' EQUITY (USD $) In Millions, except Share data, unless otherwise specified	Total	Common Stock Issued	Paid-in Capital	Retained Earnings
BALANCE at Dec. 31, 2011	$ 344.7	$ 31.7	$ 2.8	$ 310.2
BALANCE (in shares) at Dec. 31, 2011		1,972,052
Stockholders' Equity Rollforward
Net Income	49.4	0	0	49.4
Common stock	(33.6)	0	0	(33.6)
BALANCE at Dec. 31, 2012	360.5	31.7	2.8	326.0
BALANCE (in shares) at Dec. 31, 2012		1,972,052
Stockholders' Equity Rollforward
Net Income	57.4	0	0	57.4
Common stock	(33.3)	0	0	(33.3)
BALANCE at Dec. 31, 2013	384.6	31.7	2.8	350.1
BALANCE (in shares) at Dec. 31, 2013		1,972,052
Stockholders' Equity Rollforward
Net Income	33.0	0	0	33.0
Common stock	(37.4)	0	0	(37.4)
Purchase accounting adjustments	469.4		469.4	0
BALANCE at Sep. 30, 2014	$ 849.6	$ 31.7	$ 472.2	$ 345.7
BALANCE (in shares) at Sep. 30, 2014		1,972,052