Pension Benefits | Other Benefits | ||||||||||||||||||||||
2013 | 2012 | 2011 | 2013 | 2012 | 2011 | ||||||||||||||||||
Service cost | $ | 81.8 | $ | 68.7 | $ | 59.7 | $ | 0.6 | $ | 0.6 | $ | 0.6 | |||||||||||
Interest cost | 150.1 | 149.2 | 147.5 | 10.5 | 13.2 | 16.3 | |||||||||||||||||
Expected return on plan assets | (216.4 | ) | (196.0 | ) | (168.0 | ) | — | — | (0.1 | ) | |||||||||||||
Amortization of prior service cost (benefit) | 3.6 | 3.0 | 3.2 | (8.2 | ) | (13.6 | ) | (9.6 | ) | ||||||||||||||
Special termination benefits | — | — | 1.3 | — | — | — | |||||||||||||||||
Recognized net actuarial loss | 3.6 | 396.9 | 10.3 | 5.9 | 7.6 | 4.6 | |||||||||||||||||
Curtailment loss | 0.8 | — | — | — | — | — | |||||||||||||||||
Benefit cost — Company plans | 23.5 | 421.8 | 54.0 | 8.8 | 7.8 | 11.8 | |||||||||||||||||
Pension benefit cost — multi-employer plans | 23.6 | 8.5 | 9.2 | — | — | — | |||||||||||||||||
Total benefit cost | $ | 47.1 | $ | 430.3 | $ | 63.2 | $ | 8.8 | $ | 7.8 | $ | 11.8 | |||||||||||