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Company and Basis of Presentation - Change in Accounting to Statement of Cash Flows (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net (loss) income $ (67.0) $ (22.2) $ (6.6) $ (9.7) $ (13.8) $ (24.5) $ (18.1) $ 11.4 $ (105.5) $ (45.0) $ 46.1
Pension and postretirement expense                 83.4 (15.5) 107.2
Adjustments                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net (loss) income                   27.4 (58.3)
Pension and postretirement expense                   $ (46.2) $ 92.3
Change in Accounting Principal for Recognizing Actuarial Gains and Losses and Expected Returns on Plan Assets for Defined Benefit Plans | Adjustments                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net (loss) income                 (49.6)    
Pension and postretirement expense                 $ 49.6