Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Accrued capital expenditures	$ 32.3	$ 84.1	$ 28.2	$ 56.2
Capital Lease Obligations Incurred	$ 201.2	$ 0.0