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Segments - Information Concerning Principal Geographic Areas (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenue: |  |  |
Revenues | $ 5,070.8 | $ 4,835.0 | $ 5,292.1
Long-lived assets: |  |  |
Property, Plant and Equipment, Net | 135.7 |  |
Property, Plant and Equipment, Net | 129.4 | 150.4 | 236.2
Assets held for sale |  |  | 49.3
Operating Segments | Business Solutions |  |  |
Revenue: |  |  |
Revenues | 421.8 | 356.1 | 388.8
United States |  |  |
Revenue: |  |  |
Revenues | 1,702.0 | 1,678.4 | 1,896.1
Long-lived assets: |  |  |
Property, Plant and Equipment, Net | 82.0 |  |
Property, Plant and Equipment, Net |  | 100.4 | 173.7
United States | Business Solutions | Asset Held for Sale, Not Discontinued Operations |  |  |
Long-lived assets: |  |  |
Assets held for sale | 1.4 |  |
International |  |  |
Revenue: |  |  |
Revenues | 3,368.8 | 3,156.6 | 3,396.0
Long-lived assets: |  |  |
Property, Plant and Equipment, Net | 53.7 |  |
Property, Plant and Equipment, Net |  | $ 50.0 | $ 62.5
International | Business Solutions | Asset Held for Sale, Not Discontinued Operations |  |  |
Long-lived assets: |  |  |
Assets held for sale | $ 4.9 |  |

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