Property and Equipment - Table 3 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of Depreciation Expense, Amortization Expense Relating to Assets Under Capital Lease Obligations, Interest Capitalized, and Rent Expense Under Operating Leases
Depreciation expense	$ 91.0	$ 79.9	$ 67.9
Amortization expense	12.7	7.5	9.5
Interest capitalized	1.3	1.5	1.9
Rent expense:
Minimum rent payments	48.8	37.3	40.3
Contingent and other rents	21.6	18.2	20.3
Other	3.8	3.9	4.2
Total rent expense	$ 74.2	$ 59.4	$ 64.8