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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 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 $ 217.0 $ 382.0
Derivative financial instruments, Assets 8.1 3.4
Derivative Financial Instruments, liabilities 3.3 10.4
Debt 1,552.3 1,552.5
Estimate Of Fair Value Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 217.0 382.0
Derivative financial instruments, Assets 8.1 3.4
Derivative Financial Instruments, liabilities 3.3 10.4
Debt 1,866.6 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 217.0 382.0
Derivative financial instruments, Assets 0.0 0.0
Derivative Financial Instruments, liabilities 0.0 0.0
Debt 1,751.8 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 8.1 3.4
Derivative Financial Instruments, liabilities 3.3 10.4
Debt $ 114.8 $ 115.0