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Accumulated Other Comprehensive Income (AOCI) and Fair Value Measurements Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and Cash Equivalents - Fair Value $ 8.5 $ 17.6
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Debt Instrument, Fair Value Disclosure 3,728.9 3,889.4
Capital Lease Obligations, Noncurrent 7.8 8.1
Unamortized Debt Issuance Expense 7.9 8.8
Carrying Amount    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and Cash Equivalents - Fair Value 8.5 17.6
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Debt Instrument, Fair Value Disclosure 3,654.2 [1] 3,687.5 [2]
Fair Value | Fair Value, Inputs, Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and Cash Equivalents - Fair Value 8.5 17.6
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 3,728.9 3,889.4
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 a $7.8 million long-term capital lease obligation and $7.9 million of unamortized debt issuance costs.
[2] The carrying amount of long-term debt excludes an $8.1 million long-term capital lease obligation and $8.8 million of unamortized debt issuance costs.