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Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill, Gross | $ 911.3 |
Accumulated goodwill impairment loss | (808.3) |
Goodwill | 103.0 | $ 103.0
United States Print and Related Services |  |
Goodwill [Line Items] |  |
Goodwill, Gross | 881.3 |
Accumulated goodwill impairment loss | (778.3) |
Goodwill | 103.0 |
International |  |
Goodwill [Line Items] |  |
Goodwill, Gross | 30.0 |
Accumulated goodwill impairment loss | (30.0) |
Goodwill | $ 0.0 |

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