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EarningsPer Share Data Convertible Debt (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
3.75% Convertible Senior Subordinated Notes, due 2025 [Member]  
treasury stock method average share price to include dilutive securities $ 26.56ocr_TreasuryStockMethodAverageSharePriceToIncludeDilutiveSecurities
/ us-gaap_DebtInstrumentAxis
= ocr_A375ConvertibleSeniorSubordinatedNotesDue2025Member
4.00% Junior Subordinated Convertible Debentures, due 2033 [Member]  
treasury stock method average share price to include dilutive securities $ 40.82ocr_TreasuryStockMethodAverageSharePriceToIncludeDilutiveSecurities
/ us-gaap_DebtInstrumentAxis
= ocr_A400JuniorSubordinatedConvertibleDebenturesDue2033Member
3.25% Convertible Senior Debentures, Due 2035 [Member]  
treasury stock method average share price to include dilutive securities $ 77.00ocr_TreasuryStockMethodAverageSharePriceToIncludeDilutiveSecurities
/ us-gaap_DebtInstrumentAxis
= ocr_ConvertibleSeniorDebentures325Due2035Member
3.75% Convertible Senior Subordinated Notes Due 2042 [Member]  
treasury stock method average share price to include dilutive securities $ 77.00ocr_TreasuryStockMethodAverageSharePriceToIncludeDilutiveSecurities
/ us-gaap_DebtInstrumentAxis
= ocr_A375ConvertibleSeniorSubordinatedNotesDue2042Member
3.5% Convertible senior subordinated debt [Domain]  
treasury stock method average share price to include dilutive securities $ 70.00ocr_TreasuryStockMethodAverageSharePriceToIncludeDilutiveSecurities
/ us-gaap_DebtInstrumentAxis
= ocr_A3.5ConvertibleseniorsubordinateddebtDomain