Consolidated Statements of Shareowners' Deficit - USD ($) shares in Millions, $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		$ (648.5)		$ (676.7)	$ (648.5)	$ (676.7)	$ (698.2)
Net income (loss)	$ 32.6	$ 49.2	$ (18.3)	$ 7.0	353.7	75.6	(54.7)
Other comprehensive income (loss)					2.9	(40.6)	76.4
Shares issued under employee plans					0.1	1.4	2.4
Shares purchased under employee plans and other					(0.1)	(1.1)	(2.3)
Stock-based compensation					4.1	3.3	4.9
Exercise of warrants							5.2
Dividends on preferred stock					(10.4)	(10.4)	(10.4)
Balance	$ (298.2)		$ (648.5)		$ (298.2)	$ (648.5)	$ (676.7)
Preferred Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		3.1		3.1	3.1	3.1	3.1
Balance		$ 129.4		$ 129.4	$ 129.4	$ 129.4	$ 129.4
Balance	3.1		3.1		3.1	3.1	3.1
Balance	$ 129.4		$ 129.4		$ 129.4	$ 129.4	$ 129.4
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		209.6		208.7	209.6	208.7	203.0
Balance		$ 2.1		$ 2.1	$ 2.1	$ 2.1	$ 2.0
Shares issued under employee plans					0.4	1.1	1.6
Shares issued under employee plans					$ 0.0	$ 0.0	$ 0.0
Shares purchased under employee plans and other					0.0	(0.2)	(0.3)
Shares purchased under employee plans and other					$ 0.0	$ 0.0	$ 0.0
Stock-based compensation					0.0	0.0	0.0
Stock-based compensation					$ 0.0	$ 0.0	$ 0.0
Exercise of warrants							4.4
Exercise of warrants							$ 0.1
Balance	210.0		209.6		210.0	209.6	208.7
Balance	$ 2.1		$ 2.1		$ 2.1	$ 2.1	$ 2.1
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		2,582.9		2,590.6	2,582.9	2,590.6	2,590.9
Shares issued under employee plans					0.1	1.4	2.4
Shares purchased under employee plans and other					(0.7)	(2.0)	(2.3)
Stock-based compensation					4.1	3.3	4.9
Exercise of warrants							5.1
Dividends on preferred stock					(10.4)	(10.4)	(10.4)
Balance	2,576.0		2,582.9		2,576.0	2,582.9	2,590.6
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		(3,187.9)		(3,263.5)	(3,187.9)	(3,263.5)	(3,208.8)
Net income (loss)					353.7	75.6	(54.7)
Balance	(2,834.2)		(3,187.9)		(2,834.2)	(3,187.9)	(3,263.5)
AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		$ (173.9)		$ (133.3)	(173.9)	(133.3)	(209.7)
Other comprehensive income (loss)					2.9	(40.6)	76.4
Balance	$ (171.0)		$ (173.9)		$ (171.0)	$ (173.9)	$ (133.3)
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		(0.3)		(0.5)	(0.3)	(0.5)	(0.5)
Balance		$ (1.1)		$ (2.0)	$ (1.1)	$ (2.0)	$ (2.0)
Shares issued under employee plans					0.0	0.0	0.0
Shares issued under employee plans					$ 0.0	$ 0.0	$ 0.0
Shares purchased under employee plans and other					0.2	0.2	0.0
Shares purchased under employee plans and other					$ 0.6	$ 0.9	$ 0.0
Stock-based compensation					0.0	0.0	0.0
Stock-based compensation					$ 0.0	$ 0.0	$ 0.0
Balance	(0.1)		(0.3)		(0.1)	(0.3)	(0.5)
Balance	$ (0.5)		$ (1.1)		$ (0.5)	$ (1.1)	$ (2.0)