The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Revision of Previously Reported Financial Information Changes in Stockholders' Equity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Balance, beginning of period	$ 388.4us-gaap_StockholdersEquity	$ 390.5us-gaap_StockholdersEquity	$ 364.8us-gaap_StockholdersEquity	$ 381.4us-gaap_StockholdersEquity	$ 254.0us-gaap_StockholdersEquity	$ 257.4us-gaap_StockholdersEquity	$ 255.5us-gaap_StockholdersEquity	$ 293.5us-gaap_StockholdersEquity	$ 381.4us-gaap_StockholdersEquity	$ 293.5us-gaap_StockholdersEquity	$ 381.4us-gaap_StockholdersEquity	$ 293.5us-gaap_StockholdersEquity	$ 381.4us-gaap_StockholdersEquity	$ 293.5us-gaap_StockholdersEquity	$ 425.0us-gaap_StockholdersEquity
Capital contributions from parent													15.0	45.0	0
Other comprehensive income (loss)		(6.9)	29.7	(1.4)		10.8	(2.6)	(12.5)	28.3	(15.1)	21.4	(4.3)	16.7	(21.5)	7.6
Net income (loss)	(94.9)us-gaap_NetIncomeLoss	4.8us-gaap_NetIncomeLoss	(4.0)us-gaap_NetIncomeLoss	(15.2)us-gaap_NetIncomeLoss	99.6us-gaap_NetIncomeLoss	(14.2)us-gaap_NetIncomeLoss	4.5us-gaap_NetIncomeLoss	(25.5)us-gaap_NetIncomeLoss	(19.2)us-gaap_NetIncomeLoss	(21.0)us-gaap_NetIncomeLoss	(14.4)us-gaap_NetIncomeLoss	(35.2)us-gaap_NetIncomeLoss	(109.3)us-gaap_NetIncomeLoss	64.4us-gaap_NetIncomeLoss	(139.1)us-gaap_NetIncomeLoss
Change in stockholder’s equity				(16.6)				(38.0)	9.1	(36.1)	7.0	(39.5)	(77.6)	87.9	(131.5)
Balance, end of period	303.8us-gaap_StockholdersEquity	388.4us-gaap_StockholdersEquity	390.5us-gaap_StockholdersEquity	364.8us-gaap_StockholdersEquity	381.4us-gaap_StockholdersEquity	254.0us-gaap_StockholdersEquity	257.4us-gaap_StockholdersEquity	255.5us-gaap_StockholdersEquity	390.5us-gaap_StockholdersEquity	257.4us-gaap_StockholdersEquity	388.4us-gaap_StockholdersEquity	254.0us-gaap_StockholdersEquity	303.8us-gaap_StockholdersEquity	381.4us-gaap_StockholdersEquity	293.5us-gaap_StockholdersEquity
As reported
Balance, beginning of period		387.9	352.8	372.5		263.3	258.7	295.1	372.5	295.1	372.5	295.1	372.5	295.1	424.0
Capital contributions from parent														45.0	0
Other comprehensive income (loss)		(8.7)	32.3	(2.9)		10.2	0	(16.0)	29.4	(16.0)	20.7	(5.8)		(23.3)	8.8
Net income (loss)				(16.8)				(20.4)	(14.0)	(15.8)	(10.7)	(31.0)		55.7	(137.7)
Change in stockholder’s equity				(19.7)				(36.4)	15.4	(31.8)	10.0	(36.8)		77.4	(128.9)
Balance, end of period		382.5	387.9	352.8	372.5	258.3	263.3	258.7	387.9	263.3	382.5	258.3		372.5	295.1
Correction of errors
Balance, beginning of period				8.9				(1.6)	8.9	(1.6)	8.9	(1.6)	8.9	(1.6)	1.0
Capital contributions from parent														0	0
Net income (loss)				1.6				(5.1)	(5.2)	(5.2)	(3.7)	(4.2)		8.7	(1.4)
Change in stockholder’s equity				3.1				(1.6)	(6.3)	(4.3)	(3.0)	(2.7)		10.5	(2.6)
Balance, end of period		5.9	2.6	12.0	8.9	(4.3)	(5.9)	(3.2)	2.6	(5.9)	5.9	(4.3)		8.9	(1.6)
COMMON STOCK:
Balance, beginning of period																2.5
Balance, end of period	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5
COMMON STOCK: \| As reported
Balance, beginning of period																2.5
Balance, end of period		2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5	2.5		2.5	2.5	2.5
COMMON STOCK: \| Correction of errors
Balance, beginning of period																0
Balance, end of period		0	0	0	0	0	0	0	0	0	0	0		0	0	0
ADDITIONAL PAID-IN CAPITAL:
Balance, beginning of period				847.2				802.2	847.2	802.2	847.2	802.2	847.2	802.2	802.2
Capital contributions from parent													15.0	45.0	0
Balance, end of period	862.2	847.2	847.2	847.2	847.2	802.2	802.2	802.2	847.2	802.2	847.2	802.2	862.2	847.2	802.2
ADDITIONAL PAID-IN CAPITAL: \| As reported
Balance, beginning of period								802.2		802.2		802.2		802.2	802.2
Capital contributions from parent														45.0	0
Balance, end of period		847.2	847.2	847.2	847.2	802.2	802.2	802.2	847.2	802.2	847.2	802.2		847.2	802.2
ADDITIONAL PAID-IN CAPITAL: \| Correction of errors
Balance, beginning of period								0		0		0		0	0
Capital contributions from parent														0	0
Balance, end of period		0	0	0	0	0	0	0	0	0	0	0		0	0
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS):
Balance, beginning of period				(12.7)				8.8	(12.7)	8.8	(12.7)	8.8	(12.7)	8.8	1.2
Other comprehensive income (loss)				(1.4)				(12.5)	28.3	(15.1)	21.4	(4.3)	16.7	(21.5)	7.6
Balance, end of period	4.0	8.7	15.6	(14.1)	(12.7)	4.5	(6.3)	(3.7)	15.6	(6.3)	8.7	4.5	4.0	(12.7)	8.8
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS): \| As reported
Balance, beginning of period				(11.9)				11.4	(11.9)	11.4	(11.9)	11.4	(11.9)	11.4	2.6
Other comprehensive income (loss)				(2.9)				(16.0)	29.4	(16.0)	20.7	(5.8)		(23.3)	8.8
Balance, end of period		8.8	17.5	(14.8)	(11.9)	5.6	(4.6)	(4.6)	17.5	(4.6)	8.8	5.6		(11.9)	11.4
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS): \| Correction of errors
Balance, beginning of period				(0.8)				(2.6)	(0.8)	(2.6)	(0.8)	(2.6)	(0.8)	(2.6)	(1.4)
Other comprehensive income (loss)				1.5				3.5	(1.1)	0.9	0.7	1.5		1.8	(1.2)
Balance, end of period		(0.1)	(1.9)	0.7	(0.8)	(1.1)	(1.7)	0.9	(1.9)	(1.7)	(0.1)	(1.1)		(0.8)	(2.6)
RETAINED EARNINGS (ACCUMULATED DEFICIT):
Balance, beginning of period				(455.6)				(520.0)	(455.6)	(520.0)	(455.6)	(520.0)	(455.6)	(520.0)	(380.9)
Net income (loss)				(15.2)				(25.5)	(19.2)	(21.0)	(14.4)	(35.2)	(109.3)	64.4	(139.1)
Balance, end of period	(564.9)	(470.0)	(474.8)	(470.8)	(455.6)	(555.2)	(541.0)	(545.5)	(474.8)	(541.0)	(470.0)	(555.2)	(564.9)	(455.6)	(520.0)
RETAINED EARNINGS (ACCUMULATED DEFICIT): \| As reported
Balance, beginning of period				(465.3)				(521.0)	(465.3)	(521.0)	(465.3)	(521.0)	(465.3)	(521.0)	(383.3)
Net income (loss)				(16.8)				(20.4)	(14.0)	(15.8)	(10.7)	(31.0)		55.7	(137.7)
Balance, end of period		(476.0)	(479.3)	(482.1)	(465.3)	(552.0)	(536.8)	(541.4)	(479.3)	(536.8)	(476.0)	(552.0)		(465.3)	(521.0)
RETAINED EARNINGS (ACCUMULATED DEFICIT): \| Correction of errors
Balance, beginning of period				9.7				1.0	9.7	1.0	9.7	1.0	9.7	1.0	2.4
Net income (loss)				1.6				(5.1)	(5.2)	(5.2)	(3.7)	(4.2)		8.7	(1.4)
Balance, end of period		$ 6.0	$ 4.5	$ 11.3	$ 9.7	$ (3.2)	$ (4.2)	$ (4.1)	$ 4.5	$ (4.2)	$ 6.0	$ (3.2)		$ 9.7	$ 1.0