Notes to consolidated financial statements  16. INT ANGIBLE ASSETS September 27, 2014 and September 28, 2013 (Millions of dollars, unless otherwise indicated) Intangible assets with finite useful lives were as follows: Leasehold rights Software Improvements and  development of retail  network loyalty Prescription  files  Total Cost Balance as at September 29, 2012  76.4 174.6 247.2 8.9 507.1 Acquisitions  — 4.0 22.8 — 26.8 Disposals and write-offs  (5.6) (4.1) (23.3) (0.5) (33.5) Disposals related to the  discontinued operation  (note 8)  — (12.2) (5.3) — (17.5) Balance as at September 28, 2013  70.8 162.3 241.4 8.4 482.9 Acquisitions  — 3.6 16.8 — 20.4 Disposals and write-offs  (7.9) (0.8) (20.8) (0.3) (29.8) Balance as at September 27, 2014  62.9 165.1 237.4 8.1 473.5 Accumulated amortization  and impairment Balance as at September 29, 2012  (46.4) (148.2)  (107.8)  (4.9)  (307.3) Amortization  (1.4) (10.9) (19.5) (0.8) (32.6) Disposals and write-offs  5.6 4.1 22.5 0.2 32.4 Disposals related to the  discontinued operation  (note 8)  — 12.2 5.3 — 17.5 Impairment losses  (2.4) — (0.1) — (2.5) Impairment loss reversals  1.4 — — — 1.4 Balance as at September 28, 2013  (43.2) (142.8) (99.6) (5.5) (291.1) Amortization  (2.0) (9.0) (19.8) (0.7) (31.5) Disposals and write-offs  5.2 0.8 17.7 0.3 24.0 Impairment losses  (2.7) — — — (2.7) Impairment loss reversals  0.7 — — — 0.7 Balance as at September 27, 2014  (42.0) (151.0) (101.7) (5.9) (300.6) Net carrying value Balance as at September 28, 2013  27.6 19.5 141.8 2.9 191.8 Balance as at September 27, 2014  20.9 14.1 135.7 2.2 172.9 - 66 -