Six Months
Ended June 30

(in millions)

2012

2011

Gross cost at January 1

$

51.2

$

48.1

Capitalization of internally developed software and other costs

3.5

0.0

Exchange effect

0.0

0.2

Gross cost at June 30

54.7

48.3

Accumulated amortization at January 1

(33.5

)

(29.1

)

Amortization expense

(2.0

)

(2.3

)

Exchange effect

(0.1

)

(0.1

)

Accumulated amortization at June 30

(35.6

)

(31.5

)

Net book amount at June 30

$

19.1

$

16.8