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Other Comprehensive Income (OCI) and Fair Value Measurements Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 161.8 $ 3.1 $ 19.3 $ 6.6
Capital Lease Obligations, Noncurrent 8.9 9.1    
Unamortized Debt Issuance Expense 10.5 10.4    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Cash and Cash Equivalents - Fair Value 161.8 3.1    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Long-term Debt - Fair Value 3,688.5 3,299.7    
Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 161.8 3.1    
Long-term debt 3,627.1 [1] 3,460.6 [2]    
Fair Value | Fair Value, Inputs, Level 1        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Cash and Cash Equivalents - Fair Value 161.8 3.1    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Long-term Debt - Fair Value 0.0 0.0    
Fair Value | Fair Value, Inputs, Level 2        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Cash and Cash Equivalents - Fair Value 0.0 0.0    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Long-term Debt - Fair Value 3,688.5 3,299.7    
Fair Value | Fair Value, Inputs, Level 3        
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]        
Cash and Cash Equivalents - Fair Value 0.0 0.0    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]        
Long-term Debt - Fair Value 0.0 0.0    
Line of Credit | Amended Credit Agreement 2015        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term Line of Credit $ 0.0 $ 375.0    
[1] The carrying amount of long-term debt excludes an $8.9 million long-term capital lease obligation and $10.5 million of unamortized debt issuance costs.
[2] The carrying amount of long-term debt excludes a $9.1 million long-term capital lease obligation and $10.4 million of unamortized debt issuance costs.