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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 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 $ 122.4 $ 141.6
Derivative financial instruments, Assets 18.5 16.5
Derivative Financial Instruments, liabilities 1.8 5.5
Debt 1,563.5 1,553.8
Estimate Of Fair Value Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 122.4 141.6
Derivative financial instruments, Assets 18.5 16.5
Derivative Financial Instruments, liabilities 1.8 5.5
Debt 1,868.4 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 122.4 141.6
Derivative financial instruments, Assets 0.0 0.0
Derivative Financial Instruments, liabilities 0.0 0.0
Debt 1,742.4 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 18.5 16.5
Derivative Financial Instruments, liabilities 1.8 5.5
Debt $ 126.0 $ 116.3