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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair Value Measurements at Reporting Date Using Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 382.0 $ 141.6
Derivative financial instruments: Assets 0.0 0.0
Derivative financial instruments: Liabilities 0.0 0.0
Debt 1,624.4 1,736.9
Fair Value Measurements at Reporting Date Using Significant Observable Inputs (Level 2)    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 0.0 0.0
Derivative financial instruments: Assets 3.4 16.5
Derivative financial instruments: Liabilities 10.4 5.5
Debt 115.0 116.3
Total Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 382.0 141.6
Derivative financial instruments: Assets 3.4 16.5
Derivative financial instruments: Liabilities 10.4 5.5
Debt 1,552.5 1,553.8
Fair Value Measurements at Reporting Date Using Total Estimated Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 382.0 141.6
Derivative financial instruments: Assets 3.4 16.5
Derivative financial instruments: Liabilities 10.4 5.5
Debt $ 1,739.4 $ 1,853.2