December 31, 2016 | December 31, 2015 | |||||||||||||||
(in millions) | Gross Carrying Amount | Accumulated Amortization | Gross Carrying Amount | Accumulated Amortization | ||||||||||||
Contract based | $ | 8.9 | $ | (1.0 | ) | $ | 10.0 | $ | (1.2 | ) | ||||||
Technology based | 79.5 | (52.0 | ) | 79.6 | (47.5 | ) | ||||||||||
Marketing related | 14.2 | (8.9 | ) | 12.7 | (7.8 | ) | ||||||||||
Customer based | 203.9 | (89.4 | ) | 180.4 | (76.4 | ) | ||||||||||
Reported balance | $ | 306.5 | $ | (151.3 | ) | $ | 282.7 | $ | (132.9 | ) | ||||||