Consolidated Statements of Shareowners' Deficit - USD ($) shares in Millions, $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		$ (298.2)		$ (648.5)	$ (298.2)	$ (648.5)	$ (676.7)
Net income (loss)	$ (1.3)	$ 7.0	$ 32.6	$ 49.2	102.1	353.7	75.6
Other comprehensive income (loss)					80.7	2.9	(40.6)
Shares issued under employee plans					3.6	0.1	1.4
Shares purchased under employee plans and other					0.2	(0.1)	(1.1)
Stock-based compensation					$ 5.1	$ 4.1	$ 3.3
Repurchase and retirement of shares					0.2	0.0	0.0
Stock Repurchased and Retired During Period, Value					$ (4.8)
Dividends on preferred stock					(10.4)	$ (10.4)	$ (10.4)
Balance	$ (121.7)		$ (298.2)		$ (121.7)	$ (298.2)	$ (648.5)
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		42.0		41.9	42.0	41.9	41.7
Balance		$ 0.4		$ 0.4	$ 0.4	$ 0.4	$ 0.4
Shares issued under employee plans					0.3	0.1	0.2
Shares issued under employee plans					$ 0.0	$ 0.0	$ 0.0
Shares purchased under employee plans and other					0.0	0.0	0.0
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
Repurchase and retirement of shares					(0.2)
Stock Repurchased and Retired During Period, Value					$ 0.0
Balance	42.1		42.0		42.1	42.0	41.9
Balance	$ 0.4		$ 0.4		$ 0.4	$ 0.4	$ 0.4
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		2,577.7		2,584.6	2,577.7	2,584.6	2,592.3
Shares issued under employee plans					3.6	0.1	1.4
Shares purchased under employee plans and other					(0.3)	(0.7)	(2.0)
Stock-based compensation					5.1	4.1	3.3
Stock Repurchased and Retired During Period, Value					(4.8)
Dividends on preferred stock					(10.4)	(10.4)	(10.4)
Balance	2,570.9		2,577.7		2,570.9	2,577.7	2,584.6
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		(2,834.2)		(3,187.9)	(2,834.2)	(3,187.9)	(3,263.5)
Net income (loss)					102.1	353.7	75.6
Balance	(2,732.1)		(2,834.2)		(2,732.1)	(2,834.2)	(3,187.9)
AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		$ (171.0)		$ (173.9)	(171.0)	(173.9)	(133.3)
Other comprehensive income (loss)					80.7	2.9	(40.6)
Balance	$ (90.3)		$ (171.0)		$ (90.3)	$ (171.0)	$ (173.9)
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		(0.1)		(0.1)	(0.1)	(0.1)	(0.1)
Balance		$ (0.5)		$ (1.1)	$ (0.5)	$ (1.1)	$ (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					0.1	0.0	0.0
Shares purchased under employee plans and other					$ 0.5	$ 0.6	$ 0.9
Stock-based compensation					0.0	0.0	0.0
Stock-based compensation					$ 0.0	$ 0.0	$ 0.0
Balance	0.0		(0.1)		0.0	(0.1)	(0.1)
Balance	$ 0.0		$ (0.5)		$ 0.0	$ (0.5)	$ (1.1)