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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Carrying Value Reported Amount Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 124.9 $ 229.6
Derivative financial instruments, Assets 6.6 9.1
Derivative Financial Instruments, liabilities 12.3 18.7
Debt 1,929.3 1,894.1
Estimate Of Fair Value Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 124.9 229.6
Derivative financial instruments, Assets 6.6 9.1
Derivative Financial Instruments, liabilities 12.3 18.7
Debt 2,250.7 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 124.9 229.6
Derivative financial instruments, Assets 0.0 0.0
Derivative Financial Instruments, liabilities 0.0 0.0
Debt 2,108.9 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 6.6 9.1
Derivative Financial Instruments, liabilities 12.3 18.7
Debt $ 141.8 $ 106.6