Other Comprehensive Income (OCI) and Fair Value Measurements Financial Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2016		Dec. 31, 2015		Mar. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 9.3		$ 3.1		$ 28.8	$ 6.6
Capital Lease Obligations, Noncurrent	9.0		9.1
Unamortized Debt Issuance Expense	9.9		10.4
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents - Fair Value	9.3		3.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term Debt - Fair Value	3,349.7		3,299.7
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	9.3		3.1
Long-term debt	3,476.2	[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	9.3		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	3,349.7		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

[1] The carrying amount of long-term debt excludes a $9.0 million long-term capital lease obligation and $9.9 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.