Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Revenues	$ 2,012.6		$ 1,652.3		$ 1,583.6		$ 1,442.4		$ 1,647.4		$ 1,632.1		$ 1,699.4		$ 1,679.7		$ 6,690.9		$ 6,658.6		$ 8,616.5
Gross margin	468.6		429.6		438.4		431.4		459.8		468.8		471.3		421.1		1,768.0		1,821.0
Income (loss) from operations	(97.6)	[1],[2]	51.6	[1],[2]	66.3	[1],[2]	35.5	[1],[2]	(206.9)	[3],[4]	115.3	[3],[4]	112.4	[3],[4]	138.5	[3],[4]	55.8	[1],[2]	159.3	[3],[4]	640.5
Net income (loss)	(140.6)		(3.2)		(14.6)		(0.7)		(231.9)		20.8		23.8		35.9		(159.1)		(151.4)		423.0
Net income (loss) attributable to common shareholders	$ (179.6)		$ (39.4)		$ (52.6)		$ (6.5)		$ 27.0		$ 12.7		$ 15.2		$ 3.4		$ (278.1)		$ 58.3		$ 102.3
Net income (loss) per common share - basic	$ (1.18)		$ (0.23)		$ (0.33)		$ (0.06)		$ 0.48		$ 0.23		$ 0.27		$ 0.07		$ (1.80)		$ 1.09		$ 2.44
Net income (loss) per common share - diluted	$ (1.18)		$ (0.23)		$ (0.33)		$ (0.06)		$ 0.48		$ 0.23		$ 0.27		$ 0.07		$ (1.80)		$ 1.09		$ 2.43

[1] Includes a goodwill impairment of $183.0 million in the fourth quarter of 2016. See Note 7 – Goodwill.

[2] Includes an additional goodwill impairment of $24.0 million in the first quarter of 2016. See Note 7 – Goodwill.

[3] Includes $32.6 million of impairment losses in the fourth quarter of 2015. See Note 6 – Property, Plant and Equipment and Intangible Assets.

[4] Includes a provisional goodwill impairment of $290.0 million in the fourth quarter of 2015. See Note 7 – Goodwill