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Company and Basis of Presentation - Immaterial Misstatement Correction Impacts to Cash Flows From Operating Activities (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
Deferred income taxes                 (36.8) (25.6) (29.8)
Pension and postretirement expense                 83.4 (15.5) 107.2
Changes in operating assets and liabilities:                      
Inventories, net                 9.7 122.7 (69.6)
Net Cash Provided by Operating Activities                 $ 74.4 107.1 93.9
As Reported                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net (loss) income   $ (16.6) $ (10.5) $ (13.6) $ (24.2) $ (30.8) $ (24.3) $ 6.9   (72.4) 104.4
Deferred income taxes                   (41.5) 1.4
Pension and postretirement expense                   30.7 14.9
Changes in operating assets and liabilities:                      
Inventories, net                   119.9 (66.8)
Net Cash Provided by Operating Activities                   107.1 93.9
Adjustments                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net (loss) income                   27.4 (58.3)
Deferred income taxes                   15.9 (31.2)
Pension and postretirement expense                   (46.2) 92.3
Changes in operating assets and liabilities:                      
Inventories, net                   2.8 (2.8)
Net Cash Provided by Operating Activities                   $ 0.0 $ 0.0