Acquisition Purchase Price Allocation (Details) - USD ($) $ in Millions	1 Months Ended
	Jun. 30, 2015	Jun. 29, 2015
Assets acquired
Current assets		$ 1,178.2
Property, plant and equipment		7,097.9
Goodwill	$ 2,947.2
Other long-term assets, excluding Goodwill		2,393.7
Liabilities assumed
Current liabilities, including current maturities of long-term debt		(1,261.3)
Deferred credits and other liabilities		(3,774.0)
Long-term debt		(2,947.5)
Preferred stock of subsidiary		$ (51.1)
Acquisition purchase price	$ 5,583.1