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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Carrying Reported Amount Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 154.6 $ 229.6
Derivative financial instruments, Assets 3.0 9.1
Derivative Financial Instruments, liabilities 20.8 18.7
Debt 1,960.1 1,894.1
Estimate Of Fair Value Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 154.6 229.6
Derivative financial instruments, Assets 3.0 9.1
Derivative Financial Instruments, liabilities 20.8 18.7
Debt 2,122.1 1,975.0
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 154.6 229.6
Derivative financial instruments, Assets 0.0 0.0
Derivative Financial Instruments, liabilities 0.0 0.0
Debt 1,949.5 1,868.4
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 3.0 9.1
Derivative Financial Instruments, liabilities 20.8 18.7
Debt $ 172.6 $ 106.6