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INCOME TAXES - Summary of Net Operating Loss Carryforwards (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Operating Loss Carryforwards [Line Items]  
Carryforward Amount $ 285.2
Tax Benefit Amount 42.6
Valuation Allowance (24.2)
Net Tax Benefit 18.4
United States Federal Tax Authority | United States | Carryforward Period Ends 2033-2036  
Operating Loss Carryforwards [Line Items]  
Carryforward Amount 9.6
Tax Benefit Amount 2.0
Valuation Allowance 0.0
Net Tax Benefit 2.0
United States Federal Tax Authority | United States | Carryforward Period Ends 2022  
Capital Loss Carryforward [Abstract]  
Carryforward Amount 34.2
Tax Benefit Amount 0.5
Valuation Allowance (0.5)
Net Tax Benefit 0.0
United States state net operating losses | United States | Carryforward Period Ends 2018-2035  
Operating Loss Carryforwards [Line Items]  
Carryforward Amount 19.1
Tax Benefit Amount 1.2
Valuation Allowance (1.2)
Net Tax Benefit 0.0
Non-United States net operating losses | International | Carryforward Period Ends 2018-2026  
Operating Loss Carryforwards [Line Items]  
Carryforward Amount 42.3
Tax Benefit Amount 6.6
Valuation Allowance (4.6)
Net Tax Benefit 2.0
Non-United States net operating losses | International | Carryforward Period Indefinite  
Operating Loss Carryforwards [Line Items]  
Carryforward Amount 180.0
Tax Benefit Amount 32.3
Valuation Allowance (17.9)
Net Tax Benefit $ 14.4