Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Purchase commitment, amount	$ 47.8	$ 43.1
Rental expenses for operating and month-to-month leases	66.8	57.9	$ 50.4
Capital lease obligations	13.6	15.6
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017	54.3
2018	51.9
2019	47.4
2020	41.9
2021	33.2
2022 and thereafter	121.3
Total	350.0
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017	2.6
2018	2.4
2019	2.2
2020	1.9
2021	1.3
2022 and thereafter	6.4
Total	16.8
Less: Interest	(3.2)
Present value of future minimum lease payments	13.6
Less: current portion	(1.9)
Non-current portion	11.7
Outstanding letters of credit	$ 17.4	$ 18.5
Majority of standby letters of credit maturity period	1 year