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Fair Value Measurements - Assets and Liabilities Measured on a Recurring and Nonrecurring Basis (Details) - Recurring Basis [Member] - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets - cash equivalents $ 896.7 $ 990.5
Egypt, Pounds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 1.0 0.7
Angola, Kwanza    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 1.9 1.7
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets - cash equivalents 896.7 990.5
Fair Value, Inputs, Level 1 [Member] | Egypt, Pounds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 1.0  
Fair Value, Inputs, Level 1 [Member] | Angola, Kwanza    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 1.9 1.7
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets - cash equivalents 0.0 0.0
Fair Value, Inputs, Level 2 [Member] | Egypt, Pounds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 0.0 0.0
Fair Value, Inputs, Level 2 [Member] | Angola, Kwanza    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 0.0 0.0
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets - cash equivalents 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Egypt, Pounds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Angola, Kwanza    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 0.0 0.0
Other Assets [Member] | Egypt, Pounds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Assets $ 1.0 $ 0.7