Right to Use Liability - General Information (Details) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2016 USD ($) lease item	Mar. 31, 2016 USD ($) lease	Dec. 31, 2015 USD ($) item	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($) lease	Dec. 31, 2014 USD ($) lease
Right to Use Liabilities
Number of operating leases	1	2		7	2	5
Number of leases, that had construction projects				25
Number of lease accounted for as finance leases				18
Number of leases accounted for as Capital leases				18
Percentage of land value of total real property value				25.00%
Number of leases met the requirements to be reported as operating leases			30
Right to use assets derecognized | $	$ 4.6	$ 15.4	$ 122.4	$ 20.1	$ 5.4	$ 8.2
Derecognition resulted in the removal of right to use liabilities | $	$ 4.7	$ 15.4	127.0	20.0	5.4	$ 8.2
Derecognition resulted in deferred gain | $			$ 4.6	$ 0.1	$ 4.6
Number of month's rent the lease deposit is less than	2