Debt and Credit Agreements Annual Maturities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Debt Disclosure [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Year Two	$ 2.2
Long-term Debt, Maturities, Repayments of Principal in Year Three	324.2
Long-term Debt, Maturities, Repayments of Principal in Year Four	2.0
Long-term Debt, Maturities, Repayments of Principal in Year Five	2.0
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	2.1	[1]
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 1,293.1

[1] The interest coverage ratio is defined as EBITDA, as defined in the Credit Agreement, to net interest expense