Statement of Shareholders' Equity (Statement) - USD ($) $ in Millions	Total	Subsidiaries [Member]	Common Stock [Member]	Common Stock [Member] Subsidiaries [Member]	Other Additional Capital [Member]	Other Additional Capital [Member] Subsidiaries [Member]	AOCI Attributable to Parent [Member]	AOCI Attributable to Parent [Member] Subsidiaries [Member]	Retained Earnings [Member]	Retained Earnings [Member] Subsidiaries [Member]
Shares, Issued			1	41,172,173
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (283.5)	$ 616.7	$ 0.0	$ 0.4	$ 2,468.8	$ 714.4	$ (12.3)	$ (42.1)	$ (2,740.0)	$ (56.0)
Other Comprehensive Income (Loss), Net of Tax	0.3	1.0
Net income	13.6	18.3
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	13.9	19.3
Other Comprehensive Income (Loss), Net of Tax	0.9	2.9
Net income	22.5	40.3
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	23.4	43.2
Payments of Dividends		(27.0)
Shares, Issued			1	41,172,173
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(269.6)	636.0	$ 0.0	$ 0.4	2,468.8	714.4	(12.0)	(41.1)	(2,726.4)	(37.7)
Other Comprehensive Income (Loss), Net of Tax	0.3	0.9
Net income	0.4	8.6
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	0.7	9.5
Payments of Dividends		(7.0)				(7.0)
Shares, Issued			1	41,172,173
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(268.9)	638.5	$ 0.0	$ 0.4	2,468.8	707.4	(11.7)	(40.2)	(2,726.0)	(29.1)
Other Comprehensive Income (Loss), Net of Tax	0.3	1.0
Net income	8.5	13.4
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	8.8	14.4
Stockholders' Equity, Other		(0.1)				(0.1)
Payments of Dividends		(10.0)				(10.0)
Shares, Issued			1	41,172,173
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(260.1)	643.0	$ 0.0	$ 0.4	2,468.8	697.5	(11.4)	(39.2)	(2,717.5)	(15.7)
Shares, Issued			1	41,172,173
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (121.4)	$ 782.2	$ 0.0		2,601.3		(4.8)		(2,717.9)
Common Stock, Shares Authorized	1,500	50,000,000
Common Stock, Value, Issued	$ 0.0	$ 0.4
Other paid-in capital	2,601.3	822.5
Accumulated other comprehensive income	(4.8)	(31.8)
Retained Earnings (Accumulated Deficit)	(2,717.9)	$ (8.9)
Par value common shares (in USD per share)		$ 0.01
Other Comprehensive Income (Loss), Net of Tax	0.1							0.7
Net income	15.4									16.9
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	15.5	$ 17.6
Stockholders' Equity, Other		(0.3)								(0.3)
Payments of Dividends		(9.0)				(9.0)
Other Comprehensive Income (Loss), Net of Tax	0.2	2.0
Net income	(4.1)	14.1
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(3.9)	16.1
Payments of Dividends		(49.0)
Shares, Issued			1	41,172,173
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(105.9)	790.5	$ 0.0	$ 0.4	2,601.3	813.5	(4.7)	(31.1)	(2,702.5)	7.7
Other Comprehensive Income (Loss), Net of Tax	0.0							0.7
Net income	0.2									7.3
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	0.2	8.0
Payments of Dividends		(25.0)				(10.0)				(15.0)
Shares, Issued			1	41,172,173
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(105.7)	773.5	$ 0.0	$ 0.4	2,601.3	803.5	(4.7)	(30.4)	(2,702.3)	0.0
Other Comprehensive Income (Loss), Net of Tax	0.1	0.6						0.6
Net income	(19.7)	(10.1)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(19.6)	(9.5)
Stockholders' Equity, Other		0.0				0.1				(0.1)
Payments of Dividends		(15.0)				(15.0)
Shares, Issued			1	41,172,173
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (125.3)	$ 749.0	$ 0.0	$ 0.4	$ 2,601.3	$ 788.6	$ (4.6)	$ (29.8)	$ (2,722.0)	$ (10.2)
Common Stock, Shares Authorized	1,500	50,000,000
Common Stock, Value, Issued	$ 0.0	$ 0.4
Other paid-in capital	2,601.3	788.6
Accumulated other comprehensive income	(4.6)	(29.8)
Retained Earnings (Accumulated Deficit)	$ (2,722.0)	$ (10.2)
Par value common shares (in USD per share)		$ 0.01