Condensed Consolidated Statements of Operations (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Condensed Consolidated Statements of Operations    
Revenue $ 169.4 $ 156.5
Costs and expenses:    
Cost of revenue, excluding depreciation and amortization 39.3 39.5
Selling, general and administrative 57.0 53.0
Depreciation and amortization 67.3 57.6
Restructuring charges 2.2 1.1
Loss on abandonment of asset   1.2
Income from operations 3.6 4.1
Other income, net   0.1
Interest expense, net (12.7)  
(Loss) income before income taxes (9.1) 4.2
Income tax benefit (expense) 4.2 (3.8)
Net (loss) income (4.9) 0.4
Preferred stock dividends (1.0) (1.0)
Net income less preferred stock dividends $ (5.9) $ (0.6)
Earnings (loss) per share:    
Basic loss per share (in dollars per share) $ (0.08) $ (0.01)
Diluted loss per share (in dollars per share) $ (0.08) $ (0.01)
Weighted average common shares outstanding:    
Basic (in shares) 72.4 75.0
Diluted (in shares) 72.4 75.0