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Other Comprehensive Income (OCI) and Fair Value Measurements Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Line of Credit $ 0.0  
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and Cash Equivalents - Fair Value 111.4 $ 3.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Debt Instrument, Fair Value Disclosure 3,803.6 3,299.7
Capital Lease Obligations, Noncurrent 8.8 9.1
Unamortized Debt Issuance Expense 10.0 10.4
Carrying Amount    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and Cash Equivalents - Fair Value 111.4 3.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Debt Instrument, Fair Value Disclosure 3,628.0 [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 111.4 3.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Debt Instrument, Fair Value Disclosure 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]    
Debt Instrument, Fair Value Disclosure 3,803.6 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]    
Debt Instrument, Fair Value Disclosure $ 0.0 $ 0.0
[1] The carrying amount of long-term debt excludes an $8.8 million long-term capital lease obligation and $10.0 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.