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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Carrying Value Reported Amount Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 153.5 $ 141.6
Derivative financial instruments, Assets 8.1 16.5
Derivative Financial Instruments, liabilities 4.7 5.5
Debt 1,563.0 1,553.8
Estimate Of Fair Value Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 153.5 141.6
Derivative financial instruments, Assets 8.1 16.5
Derivative Financial Instruments, liabilities 4.7 5.5
Debt 1,945.8 1,853.2
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 153.5 141.6
Derivative financial instruments, Assets 0.0 0.0
Derivative Financial Instruments, liabilities 0.0 0.0
Debt 1,820.3 1,736.9
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 16.5
Derivative Financial Instruments, liabilities 4.7 5.5
Debt $ 125.5 $ 116.3