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Acquisition Acquisition (Tables)
12 Months Ended
Dec. 31, 2017
Business Combinations [Abstract]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Pro forma results of operations for this acquisition have not been presented as it is not material to the consolidated statement of earnings. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the date of the acquisition (in millions of dollars):
Cash
$
1.8

Other current assets
3.6

Goodwill
18.7

Intangibles
18.3

Other noncurrent assets
0.5

Current liabilities
(3.9
)
Purchase price paid at closing
$
39.0