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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Carrying Value Reported Amount Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 511.3 $ 382.0
Derivative financial instruments, Assets 17.5 3.4
Derivative Financial Instruments, liabilities 5.1 10.4
Debt 1,562.1 1,552.5
Estimate Of Fair Value Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 511.3 382.0
Derivative financial instruments, Assets 17.5 3.4
Derivative Financial Instruments, liabilities 5.1 10.4
Debt 1,794.8 1,739.4
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 511.3 382.0
Derivative financial instruments, Assets 0.0 0.0
Derivative Financial Instruments, liabilities 0.0 0.0
Debt 1,670.2 1,624.4
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 17.5 3.4
Derivative Financial Instruments, liabilities 5.1 10.4
Debt $ 124.6 $ 115.0