Derivatives and Fair Value Measurements - Financial Instruments Measured on Recurring Basis (Details) - Successor - Fair Value, Measurements, Recurring $ in Millions	Sep. 30, 2017 USD ($)
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 8.6
Foreign currency cash flow hedge contracts
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	8.6
Level 1
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.0
Level 1 | Foreign currency cash flow hedge contracts
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.0
Level 2
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	8.6
Level 2 | Foreign currency cash flow hedge contracts
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	8.6
Level 3
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.0
Level 3 | Foreign currency cash flow hedge contracts
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 0.0