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Long-Term Debt Long-term Debt Maturity Schedule (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Debt Instrument [Line Items]  
2015 $ 35.2us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2016 17.1us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2017 19.1us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2018 109.2us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
2019 403.4us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Thereafter 952.4us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Debt $ 1,536.4us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities