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Income Taxes Income Tax Provision (Benefit) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Predecessor        
Income Tax Provision (Benefit) [Line Items]        
Current Federal Tax Expense (Benefit) $ (3.1)   $ (12.4) $ (71.9)
Current Foreign Tax Expense (Benefit) 8.3   14.4 3.7
Current State and Local Tax Expense (Benefit) (6.7)   0.5 (0.6)
Current Income Tax Expense (Benefit) (1.5)   2.5 (68.8)
Deferred Federal Income Tax Expense (Benefit) (101.0)   (82.1) (117.4)
Deferred Foreign Income Tax Expense (Benefit) (160.4)   (12.8) (15.0)
Deferred State and Local Income Tax Expense (Benefit) (0.9)   (2.1) (5.9)
Deferred Income Tax Expense (Benefit) (262.3)   (97.0) (138.3)
Income Tax (Benefit) Expense $ (263.8)   $ (94.5) $ (207.1)
Successor        
Income Tax Provision (Benefit) [Line Items]        
Current Federal Tax Expense (Benefit)   $ (101.4)    
Current Foreign Tax Expense (Benefit)   40.4    
Current State and Local Tax Expense (Benefit)   (0.4)    
Current Income Tax Expense (Benefit)   (61.4)    
Deferred Federal Income Tax Expense (Benefit)   (85.1)    
Deferred Foreign Income Tax Expense (Benefit)   (14.5)    
Deferred State and Local Income Tax Expense (Benefit)   0.0    
Deferred Income Tax Expense (Benefit)   (99.6)    
Income Tax (Benefit) Expense   $ (161.0)