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Segment Information (Assets by Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Net pension income | $ (12.4) | $ (9.6) | $ (5.1)
Assets | 2,469.1 | 2,452.4 | 2,570.1
United States Print and Related Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 2,057.8 | 2,060.9 | 2,241.3
International |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 341.5 | 329.5 | 312.7
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | 2,399.3 | 2,390.4 | 2,554.0
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Assets | $ 69.8 | $ 62.0 | $ 16.1

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