Leases (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leased Assets [Line Items]
2017		$ 89.6
2018		53.8
2019		30.5
2020		24.3
2021		19.1
Thereafter		13.1
Total Due		230.4
Rent expense		125.4	$ 84.3	$ 67.7
Real Estate
Operating Leased Assets [Line Items]
2017		52.3
2018		39.5
2019		24.4
2020		21.6
2021		17.3
Thereafter		12.2
Total Due		167.3
Vehicles and Equipment
Operating Leased Assets [Line Items]
2017	[1]	37.3
2018	[1]	14.3
2019	[1]	6.1
2020	[1]	2.7
2021	[1]	1.8
Thereafter	[1]	0.9
Total Due		$ 63.1
Minimum | Vehicles and Equipment
Operating Leased Assets [Line Items]
Term of operating lease		36
Maximum | Vehicles and Equipment
Operating Leased Assets [Line Items]
Term of operating lease		60 months

[1] The Company leases vehicles with contractual terms of 36 to 60 months that are cancellable after 12 months without penalty. Future minimum lease payments reflect only the minimum payments during the initial 12-month non-cancellable term.