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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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