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The components of pension expense are as follows:
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Year Ended December 31, |
2013 | 2012 | 2011 | |||||||||
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Service cost |
$ | 73.5 | $ | 64.1 | $ | 45.5 | ||||||
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Interest on projected benefit obligation |
81.0 | 81.4 | 81.6 | |||||||||
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Expected return on assets |
(119.4 | ) | (110.8 | ) | (105.1 | ) | ||||||
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Amortization of prior service costs |
1.3 | 1.4 | 1.5 | |||||||||
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Recognized actuarial loss |
44.0 | 39.2 | 24.7 | |||||||||
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Curtailment gain |
(.3 | ) | ||||||||||
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Settlement loss |
4.8 | |||||||||||
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Net pension expense |
$ | 80.1 | $ | 80.1 | $ | 48.2 | ||||||
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