Significant Accounting Policies and Practices - Schedule of Contract with Customer (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Assets
Notes and accounts receivable, net	$ 136.4	$ 122.3
Leasehold improvements, equipment and construction in progress, net	26.3	27.4
Other assets, net	19.1	18.3
Liabilities
Accrued expenses	30.4	25.5
Contract with customer, asset	10.8	12.2
Contract with customer, liability	16.5	$ 20.5
Accounting Standards Update 2017-10 and 2014-09
Assets
Notes and accounts receivable, net	136.4
Leasehold improvements, equipment and construction in progress, net	26.3
Other assets, net	19.1
Liabilities
Accrued expenses	30.4
Accounting Standards Update 2014-09
Liabilities
Contract with customer, asset	10.6
Contract with customer, liability	10.6
Accounting Standards Update 2017-10
Liabilities
Leasehold improvement on service concession contracts	0.5
Balances without Adoption of Topics 606 and 853 | Accounting Standards Update 2017-10 and 2014-09
Assets
Notes and accounts receivable, net	125.8
Leasehold improvements, equipment and construction in progress, net	26.8
Other assets, net	18.6
Liabilities
Accrued expenses	19.8
Impact of Adoption Increase/(Decrease) | Accounting Standards Update 2017-10 and 2014-09
Assets
Notes and accounts receivable, net	10.6
Leasehold improvements, equipment and construction in progress, net	(0.5)
Other assets, net	0.5
Liabilities
Accrued expenses	$ 10.6