Property and Equipment - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 55.8	$ 32.3	$ 108.3	$ 54.5
Accumulated amortization	$ 1.4		$ 1.4		$ 0