Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Summarized Unaudited Quarterly Financial Data

Summarized unaudited quarterly financial data (in millions, except per share data) was as follows:

	Quarters Ended
	March 31,					June 30,				September 30,				December 31,
	2016		2015			2016		2015		2016		2015		2016		2015
Revenues	$	918.5	$	933.3		$	1,040.2	$	1,042.2	$	1,075.7	$	1,019.7	$	1,111.4	$	1,057.0
Income from operations	$	330.6	$	224.1		$	424.0	$	302.1	$	420.5	$	344.0	$	491.6	$	322.0
Net income	$	168.3	$	50.6		$	247.6	$	93.8	$	238.6	$	182.9	$	301.4	$	184.4
Basic earnings (loss) per share	$	0.22	$	(0.04	)	$	0.39	$	0.05	$	0.37	$	0.25	$	0.50	$	0.25
Diluted earnings (loss) per share	$	0.21	$	(0.04	)	$	0.38	$	0.05	$	0.36	$	0.24	$	0.50	$	0.25