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Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amount of property and equipment
Property and equipment gross	$ 600.3	$ 546.6
Accumulated depreciation and amortization	249.9	216.8
Total property and equipment, net	350.3	329.8
Depreciation expense	45.6	44.1	$ 42.5
Land
Amount of property and equipment
Property and equipment gross	27.3	28.0
Buildings and leasehold improvements
Amount of property and equipment
Property and equipment gross	$ 81.0	87.2
Buildings and leasehold improvements | Minimum
Amount of property and equipment
Estimated useful lives	3 years
Buildings and leasehold improvements | Maximum
Amount of property and equipment
Estimated useful lives	40 years
Office equipment, furniture and fixtures
Amount of property and equipment
Property and equipment gross	$ 20.6	15.5
Office equipment, furniture and fixtures | Minimum
Amount of property and equipment
Estimated useful lives	3 years
Office equipment, furniture and fixtures | Maximum
Amount of property and equipment
Estimated useful lives	7 years
Computer equipment and software costs
Amount of property and equipment
Property and equipment gross	$ 194.7	169.4
Computer equipment and software costs | Minimum
Amount of property and equipment
Estimated useful lives	3 years
Computer equipment and software costs | Maximum
Amount of property and equipment
Estimated useful lives	9 years
Machinery, equipment and vehicles
Amount of property and equipment
Property and equipment gross	$ 276.7	246.5
Machinery, equipment and vehicles | Minimum
Amount of property and equipment
Estimated useful lives	3 years
Machinery, equipment and vehicles | Maximum
Amount of property and equipment
Estimated useful lives	40 years
Computer software costs
Computer software costs
Computer software costs	$ 115.6	108.0
Accumulated amortization	91.2	80.3
Computer software costs, net	24.5	27.7
Computer software costs	115.6	108.0
Amortization expense related to computer software costs	10.9	11.0	$ 13.7
Software development in progress
Computer software costs
Computer software costs	46.2	27.6
Computer software costs	46.2	27.6
Capital lease
Amount of property and equipment
Property and equipment gross	30.9	25.5
Accumulated depreciation and amortization	18.4	16.0
Total property and equipment, net	$ 12.4	$ 9.5

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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