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Indebtedness (Maturities of Long-term Debt) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Aggregate scheduled maturities of long-term debt, excluding current maturities    
2016 $ 268.0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017 24.5us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018 4.8us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
2019 384.9us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Thereafter 315.4us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Total indebtedness, less current portion $ 997.6us-gaap_LongTermDebtNoncurrent $ 938.5us-gaap_LongTermDebtNoncurrent