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Stockholders' Equity (Deficit) Accumulated Other Comprehensive Income and Redeemable Noncontrolling Interest - Change in Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income and Redeemable Noncontrolling Interest (Detail) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
0 Months Ended 9 Months Ended 9 Months Ended
Aug. 13, 2014
Sep. 30, 2014
Sep. 30, 2014
Common Stock [Member]
Sep. 30, 2014
Treasury Stock [Member]
Dec. 31, 2013
Treasury Stock [Member]
Sep. 30, 2014
Capital in Excess of Par Value [Member]
Sep. 30, 2014
Accumulated Deficit [Member]
Sep. 30, 2014
Foreign Currency Translation [Member]
Sep. 30, 2014
Benefit Plan Liabilities [Member]
Sep. 30, 2014
Unrealized Gain (Loss) on Available- For-Sale Investments [Member]
Sep. 30, 2014
Noncontrolling Interest [Member]
Sep. 30, 2014
Redeemable Non- controlling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Beginning Balance   $ (110.1) $ 0.2 $ (6.6) $ (6.6) $ 189.7 $ (107.1) $ (16.6) $ (174.9) $ 3.3 $ 1.9  
Beginning Balance   1.3                   1.3
Beginning Balance, shares     21,250 213 213              
Net income (loss)   (30.7)         (30.5)       (0.2)  
Net income (loss)                       (0.2)
Issuance of common stock in connection with initial public offering   112.4 0.1     112.3            
Issuance of common stock in connection with initial public offering, Shares 11,000   11,000                  
Foreign currency translation   (10.0)           (10.0)       0.1
Changes in defined benefit pension and other post-retirement benefit plans, net of tax provision   4.5             4.5      
Unrealized loss on available-for-sale investment, net of tax benefit   (5.5)               (5.5)    
Ending Balance   (39.4) 0.3 (6.6) (6.6) 302.0 (137.6) (26.6) (170.4) (2.2) 1.7  
Ending Balance   $ 1.2                   $ 1.2
Ending Balance, shares     32,250 213 213