CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Deficit	Accumulated Other Comprehensive Loss	Stockholders’ Equity Attributable to Parent	Non-controlling Interests
Beginning balance at Dec. 31, 2017	$ 14,181.3	$ 508.1	$ (573.5)	$ 10,362.0	$ 4,611.2	$ (763.1)	$ 14,144.7	$ 36.6
Comprehensive income (loss)	20.5	0.0	0.0	0.0	185.0	(164.5)	20.5	0.0
Dividends declared on common stock	(224.8)	0.0	0.0	0.0	(224.8)	0.0	(224.8)	0.0
Equity compensation, net of tax	27.4	1.2	(10.8)	37.0	0.0	0.0	27.4	0.0
Impact of adoption due to change in accounting standard | Accounting Standards Update 2016-06	(9.5)	0.0	0.0	0.0	53.1	(62.6)	(9.5)	0.0
Portion of net (income) loss attributable to non-controlling interests	(3.7)	0.0	0.0	0.0	0.0	0.0	0.0	(3.7)
Ending balance at Jun. 30, 2018	13,991.2	509.3	(584.3)	10,399.0	4,624.5	(990.2)	13,958.3	32.9
Beginning balance at Mar. 31, 2018	14,167.3	508.8	(580.2)	10,371.5	4,542.5	(711.7)	14,130.9	36.4
Comprehensive income (loss)	(84.2)	0.0	0.0	0.0	131.7	(215.9)	(84.2)	0.0
Dividends declared on common stock	(112.3)	0.0	0.0	0.0	(112.3)	0.0	(112.3)	0.0
Equity compensation, net of tax	23.9	0.5	(4.1)	27.5	0.0	0.0	23.9	0.0
Impact of adoption due to change in accounting standard | Accounting Standards Update 2016-06	0.0	0.0	0.0	0.0	62.6	(62.6)	0.0	0.0
Portion of net (income) loss attributable to non-controlling interests	(3.5)	0.0	0.0	0.0	0.0	0.0	0.0	(3.5)
Ending balance at Jun. 30, 2018	13,991.2	509.3	(584.3)	10,399.0	4,624.5	(990.2)	13,958.3	32.9
Beginning balance at Dec. 31, 2018	5,253.2	446.1	(584.7)	8,781.1	(2,511.3)	(912.8)	5,218.4	34.8
Comprehensive income (loss)	(69.9)	0.0	0.0	0.0	(61.4)	(8.5)	(69.9)	0.0
Dividends declared on common stock	(195.9)	0.0	0.0	(195.9)	0.0	0.0	(195.9)	0.0
Equity compensation, net of tax	16.1	0.8	(4.5)	19.8	0.0	0.0	16.1	0.0
Impact of adoption due to change in accounting standard | Accounting Standards Update 2016-06	0.5	0.0	0.0	0.0	0.5	0.0	0.5	0.0
Portion of net (income) loss attributable to non-controlling interests	0.6	0.0	0.0	0.0	0.0	0.0	0.0	0.6
Ending balance at Jun. 30, 2019	5,004.6	446.9	(589.2)	8,605.0	(2,572.2)	(921.3)	4,969.2	35.4
Beginning balance at Mar. 31, 2019	4,983.1	446.5	(587.7)	8,688.1	(2,662.0)	(936.5)	4,948.4	34.7
Comprehensive income (loss)	105.0	0.0	0.0	0.0	89.8	15.2	105.0	0.0
Dividends declared on common stock	(98.2)	0.0	0.0	(98.2)	0.0	0.0	(98.2)	0.0
Equity compensation, net of tax	14.0	0.4	(1.5)	15.1	0.0	0.0	14.0	0.0
Portion of net (income) loss attributable to non-controlling interests	0.7	0.0	0.0	0.0	0.0	0.0	0.0	0.7
Ending balance at Jun. 30, 2019	$ 5,004.6	$ 446.9	$ (589.2)	$ 8,605.0	$ (2,572.2)	$ (921.3)	$ 4,969.2	$ 35.4