Condensed Consolidated Statements of Shareowners' Deficit - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance, Shareowners' Equity (Deficit)	$ (204.6)	$ (112.3)	$ (140.0)	$ (75.0)
Net loss	(8.2)	(13.6)	(50.0)	(46.0)
Other comprehensive income (loss)	9.7	(1.1)	(9.8)	(3.4)
Shares purchased under employee plans and other			(1.1)	(0.8)
Stock-based compensation	1.2	2.0	4.2	5.4
Dividends on preferred stock	(2.6)	(2.6)	(7.8)	(7.8)
Ending Balance, Shareowners' Equity (Deficit)	(204.5)	(127.6)	(204.5)	(127.6)
Cumulative Convertible Preferred Shares [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance, Shareowners' Equity (Deficit)	$ 129.4	$ 129.4	$ 129.4	$ 129.4
Beginning Balance, Shares	3.1	3.1	3.1	3.1
Ending Balance, Shareowners' Equity (Deficit)	$ 129.4	$ 129.4	$ 129.4	$ 129.4
Ending Balance, Shares	3.1	3.1	3.1	3.1
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance, Shareowners' Equity (Deficit)	$ 0.5	$ 0.5	$ 0.5	$ 0.5
Beginning Balance, Shares	50.7	50.4	50.4	50.2
Shares issued under employee plans			0.3	0.2
Ending Balance, Shareowners' Equity (Deficit)	$ 0.5	$ 0.5	$ 0.5	$ 0.5
Ending Balance, Shares	50.7	50.4	50.7	50.4
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance, Shareowners' Equity (Deficit)	$ 2,672.9	$ 2,677.4	$ 2,676.2	$ 2,680.0
Shares purchased under employee plans and other			(1.1)	(0.8)
Stock-based compensation	1.2	2.0	4.2	5.4
Dividends on preferred stock	(2.6)	(2.6)	(7.8)	(7.8)
Ending Balance, Shareowners' Equity (Deficit)	2,671.5	2,676.8	2,671.5	2,676.8
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance, Shareowners' Equity (Deficit)	(2,817.8)	(2,741.8)	(2,776.0)	(2,709.4)
Net loss	(8.2)	(13.6)	(50.0)	(46.0)
Ending Balance, Shareowners' Equity (Deficit)	(2,826.0)	(2,755.4)	(2,826.0)	(2,755.4)
AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance, Shareowners' Equity (Deficit)	(189.6)	(177.8)	(170.1)	(175.5)
Other comprehensive income (loss)	9.7	(1.1)	(9.8)	(3.4)
Ending Balance, Shareowners' Equity (Deficit)	$ (179.9)	$ (178.9)	$ (179.9)	$ (178.9)