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Future Minimum Rental Commitments (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Lease Obligations [Line Items]      
2015 $ 20.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 14.2us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 9.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 4.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 1.8us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Future years 0.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total 50.4us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Future rental commitments for discontinued operations 0.3amed_OperatingLeaseCommitmentsForDiscontinuedOperations    
Rent expense for non-cancelable operating leases $ 26.5amed_OperatingLeasesRentExpenseNetForContinuingOperations $ 29.8amed_OperatingLeasesRentExpenseNetForContinuingOperations $ 30.7amed_OperatingLeasesRentExpenseNetForContinuingOperations
Minimum [Member]      
Operating Lease Obligations [Line Items]      
Operating lease term, years 1 year    
Maximum [Member]      
Operating Lease Obligations [Line Items]      
Operating lease term, years 7 years