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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Carrying Value Reported Amount Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 639.0 $ 490.8
Derivative financial instruments, Assets 0.8 5.6
Derivative Financial Instruments, liabilities 13.4 7.5
Debt 1,712.4 1,411.2
Estimate Of Fair Value Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 639.0 490.8
Derivative financial instruments, Assets 0.8 5.6
Derivative Financial Instruments, liabilities 13.4 7.5
Debt 1,580.1 1,676.5
Estimate Of Fair Value Fair Value Disclosure | Fair Value Inputs Level 1    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 639.0 490.8
Derivative financial instruments, Assets 0.0 0.0
Derivative Financial Instruments, liabilities 0.0 0.0
Debt 1,155.2 1,552.8
Estimate Of Fair Value Fair Value Disclosure | Fair Value 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 0.8 5.6
Derivative Financial Instruments, liabilities 13.4 7.5
Debt $ 424.9 $ 123.7