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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Carrying Reported Amount Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 156.9 $ 149.8
Derivative financial instruments, Assets 0.5 2.4
Derivative Financial Instruments, liabilities 72.7 71.3
Debt 1,649.2 1,495.7
Estimate Of Fair Value Fair Value Disclosure    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 156.9 149.8
Derivative financial instruments, Assets 0.5 2.4
Derivative Financial Instruments, liabilities 72.7 71.3
Debt 1,450.4 969.7
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 156.9 149.8
Derivative financial instruments, Assets 0.0 0.0
Derivative Financial Instruments, liabilities 0.0 0.0
Debt 1,292.1 964.5
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 0.5 2.4
Derivative Financial Instruments, liabilities 72.7 71.3
Debt $ 158.3 $ 5.2