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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
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 $ 490.8 $ 382.0
Derivative financial instruments: Assets 0.0 0.0
Derivative financial instruments: Liabilities 0.0 0.0
Debt 1,552.8 1,624.4
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 5.6 3.4
Derivative financial instruments: Liabilities 7.5 10.4
Debt 123.7 115.0
Total Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 490.8 382.0
Derivative financial instruments: Assets 5.6 3.4
Derivative financial instruments: Liabilities 7.5 10.4
Debt 1,411.2 1,552.5
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 490.8 382.0
Derivative financial instruments: Assets 5.6 3.4
Derivative financial instruments: Liabilities 7.5 10.4
Debt $ 1,676.5 $ 1,739.4