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Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property and Equipment
Property and equipment before accumulated depreciation and amortization	$ 652.3	$ 654.8
Less: Accumulated depreciation and amortization	309.7	293.9
Total property and equipment, net	342.6	360.9
Depreciation expense	52.7	54.5	$ 45.6
Computer software costs
Computer software costs	191.7	169.9
Less: Accumulated amortization	116.1	110.0
Computer software costs, net	75.6	59.9
Computer software costs	191.7	169.9
Amortization expense related to computer software costs	18.5	17.8	$ 10.9
Land
Property and Equipment
Property and equipment before accumulated depreciation and amortization	19.1	22.3
Buildings and leasehold improvements
Property and Equipment
Property and equipment before accumulated depreciation and amortization	$ 74.5	84.8
Buildings and leasehold improvements | Minimum
Property and Equipment
Estimated useful lives	3 years
Buildings and leasehold improvements | Maximum
Property and Equipment
Estimated useful lives	40 years
Office equipment, furniture and fixtures
Property and Equipment
Property and equipment before accumulated depreciation and amortization	$ 15.3	16.9
Office equipment, furniture and fixtures | Minimum
Property and Equipment
Estimated useful lives	3 years
Office equipment, furniture and fixtures | Maximum
Property and Equipment
Estimated useful lives	7 years
Computer equipment and software costs
Property and Equipment
Property and equipment before accumulated depreciation and amortization	$ 275.8	261.4
Computer equipment and software costs | Minimum
Property and Equipment
Estimated useful lives	3 years
Computer equipment and software costs | Maximum
Property and Equipment
Estimated useful lives	9 years
Machinery, equipment and vehicles
Property and Equipment
Property and equipment before accumulated depreciation and amortization	$ 267.7	269.3
Machinery, equipment and vehicles | Minimum
Property and Equipment
Estimated useful lives	3 years
Machinery, equipment and vehicles | Maximum
Property and Equipment
Estimated useful lives	40 years
Software development in progress
Computer software costs
Computer software costs	$ 13.7	22.5
Computer software costs	$ 13.7	$ 22.5

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- Definition

For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

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Amount of expense for amortization of capitalized computer software costs.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.

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