Supplemental Guarantor Information Supplemental Guarantor Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Net cash used by operating activities		$ 7.4	$ (372.1)
Cash flow from investing activities:
Capital expenditures		(30.2)	(40.5)
Payments for acquisitions	$ (5.8)	0.0	(5.9)
Proceeds from maturities of short-term investments		185.9	275.0
Payments for purchases of short-term investments		(157.9)	(126.5)
Proceeds from sale of assets		29.8	10.8
Increase in certain other assets		(17.4)	(22.8)
Capital contributions and loans paid		0.0	0.0
Proceeds from intercompany loans		0.0	0.0
Net cash used by investing activities		10.2	90.1
Cash flow from financing activities:
Dividends paid		0.0	(7.7)
Revolving credit facility (repayments) borrowings, net		(125.0)	185.0
Other debt borrowings		395.3	706.0
Other debt repayments		(342.9)	(306.7)
Distributions and payments to noncontrolling interest holders		(98.1)	(337.8)
Other		(1.7)	(3.0)
Capital contributions received and loans incurred		0.0	0.0
Payments on intercompany loans		0.0	0.0
Net cash provided by financing activities		(184.9)	196.9
Effect of exchange rate changes on cash and cash equivalents		(7.2)	(14.4)
Decrease in cash, cash equivalents and restricted cash		(174.5)	(99.5)
Add: Cash included in assets held for sale at beginning of period	0.0	7.3	0.0
Less: Cash included in assets held for sale at end of period		38.9	0.0
Cash, cash equivalents and restricted cash at the beginning of the period	543.2	458.4	543.2
Cash, cash equivalents and restricted cash at the end of the period		252.3	443.7
Payments of Debt Issuance Costs		12.5	38.9
Reportable Legal Entities [Member] | Parent Company [Member]
Net cash used by operating activities		64.7	(108.5)
Cash flow from investing activities:
Capital expenditures		(3.5)	(4.7)
Payments for acquisitions			0.0
Proceeds from maturities of short-term investments		3.1	74.0
Payments for purchases of short-term investments		0.0	0.0
Proceeds from sale of assets		21.3	6.7
Increase in certain other assets		(4.2)	(4.6)
Capital contributions and loans paid		(36.4)	(487.2)
Proceeds from intercompany loans		11.4	25.2
Net cash used by investing activities		(8.3)	(390.6)
Cash flow from financing activities:
Dividends paid			(7.7)
Revolving credit facility (repayments) borrowings, net		(110.0)	115.0
Other debt borrowings		374.3	660.0
Other debt repayments		(307.0)	(274.5)
Distributions and payments to noncontrolling interest holders		0.0	0.0
Other		(1.4)	(3.0)
Capital contributions received and loans incurred		0.0	0.0
Payments on intercompany loans		0.0	0.0
Net cash provided by financing activities		(56.6)	450.9
Effect of exchange rate changes on cash and cash equivalents		0.0	0.0
Decrease in cash, cash equivalents and restricted cash		(0.2)	(48.2)
Add: Cash included in assets held for sale at beginning of period		0.0
Less: Cash included in assets held for sale at end of period		0.0
Cash, cash equivalents and restricted cash at the beginning of the period	58.5	17.3	58.5
Cash, cash equivalents and restricted cash at the end of the period		17.1	10.3
Payments of Debt Issuance Costs		12.5	38.9
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Net cash used by operating activities		(28.4)	(24.4)
Cash flow from investing activities:
Capital expenditures		0.0	(0.1)
Payments for acquisitions			0.0
Proceeds from maturities of short-term investments		0.0	0.0
Payments for purchases of short-term investments		0.0	0.0
Proceeds from sale of assets		0.0	0.0
Increase in certain other assets		0.0	0.0
Capital contributions and loans paid		0.0	0.0
Proceeds from intercompany loans		0.0	0.0
Net cash used by investing activities		0.0	(0.1)
Cash flow from financing activities:
Dividends paid			0.0
Revolving credit facility (repayments) borrowings, net		0.0	0.0
Other debt borrowings		0.0	0.0
Other debt repayments		0.0	(0.3)
Distributions and payments to noncontrolling interest holders		0.0	0.0
Other		0.0	0.0
Capital contributions received and loans incurred		35.9	43.0
Payments on intercompany loans		(8.3)	(16.6)
Net cash provided by financing activities		27.6	26.1
Effect of exchange rate changes on cash and cash equivalents		0.0	0.0
Decrease in cash, cash equivalents and restricted cash		(0.8)	1.6
Add: Cash included in assets held for sale at beginning of period		0.0
Less: Cash included in assets held for sale at end of period		0.0
Cash, cash equivalents and restricted cash at the beginning of the period	2.3	2.7	2.3
Cash, cash equivalents and restricted cash at the end of the period		1.9	3.9
Payments of Debt Issuance Costs		0.0	0.0
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Net cash used by operating activities		(28.9)	(239.2)
Cash flow from investing activities:
Capital expenditures		(26.7)	(35.7)
Payments for acquisitions			(5.9)
Proceeds from maturities of short-term investments		182.8	201.0
Payments for purchases of short-term investments		(157.9)	(126.5)
Proceeds from sale of assets		8.5	4.1
Increase in certain other assets		(13.2)	(18.2)
Capital contributions and loans paid		0.0	0.0
Proceeds from intercompany loans		0.0	0.0
Net cash used by investing activities		(6.5)	18.8
Cash flow from financing activities:
Dividends paid			0.0
Revolving credit facility (repayments) borrowings, net		(15.0)	70.0
Other debt borrowings		21.0	46.0
Other debt repayments		(35.9)	(31.9)
Distributions and payments to noncontrolling interest holders		(98.1)	(337.8)
Other		(0.3)	0.0
Capital contributions received and loans incurred		0.5	444.2
Payments on intercompany loans		(3.1)	(8.6)
Net cash provided by financing activities		(130.9)	181.9
Effect of exchange rate changes on cash and cash equivalents		(7.2)	(14.4)
Decrease in cash, cash equivalents and restricted cash		(173.5)	(52.9)
Add: Cash included in assets held for sale at beginning of period		7.3
Less: Cash included in assets held for sale at end of period		38.9
Cash, cash equivalents and restricted cash at the beginning of the period	482.4	438.4	482.4
Cash, cash equivalents and restricted cash at the end of the period		233.3	429.5
Payments of Debt Issuance Costs		0.0	0.0
Consolidation, Eliminations [Member]
Net cash used by operating activities		0.0	0.0
Cash flow from investing activities:
Capital expenditures		0.0	0.0
Payments for acquisitions			0.0
Proceeds from maturities of short-term investments		0.0	0.0
Payments for purchases of short-term investments		0.0	0.0
Proceeds from sale of assets		0.0	0.0
Increase in certain other assets		0.0	0.0
Capital contributions and loans paid		36.4	487.2
Proceeds from intercompany loans		(11.4)	(25.2)
Net cash used by investing activities		25.0	462.0
Cash flow from financing activities:
Dividends paid			0.0
Revolving credit facility (repayments) borrowings, net		0.0	0.0
Other debt borrowings		0.0	0.0
Other debt repayments		0.0	0.0
Distributions and payments to noncontrolling interest holders		0.0	0.0
Other		0.0	0.0
Capital contributions received and loans incurred		(36.4)	(487.2)
Payments on intercompany loans		11.4	25.2
Net cash provided by financing activities		(25.0)	(462.0)
Effect of exchange rate changes on cash and cash equivalents		0.0	0.0
Decrease in cash, cash equivalents and restricted cash		0.0	0.0
Add: Cash included in assets held for sale at beginning of period		0.0
Less: Cash included in assets held for sale at end of period		0.0
Cash, cash equivalents and restricted cash at the beginning of the period	$ 0.0	0.0	0.0
Cash, cash equivalents and restricted cash at the end of the period		0.0	0.0
Payments of Debt Issuance Costs		$ 0.0	$ 0.0