Accounting Changes and Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended								6 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019	Jan. 01, 2018
Assets:
Other current assets, net	$ 227.3				$ 333.3						$ 227.3	$ 333.3			$ 238.7
Other assets, net	872.6				703.4						872.6	703.4		$ 845.0	533.3
Liabilities:
Current portion of deferred revenue	160.9				161.7						160.9	161.7			156.7
Other long-term liabilities	579.1				552.9						579.1	552.9		660.6	723.4
Equity:
Accumulated deficit	(1,447.1)				(1,367.0)						(1,447.1)	(1,367.0)
Noncontrolling interests	870.1				1,010.8						870.1	1,010.8
Revenue	974.6	$ 966.8	$ 982.9	$ 942.7	948.5	$ 925.2	$ 922.1	$ 909.9	$ 3,867.0	$ 3,705.7	3,867.0	3,705.7	$ 3,590.0
Other accrued and current liabilities	$ 594.7				$ 567.4						594.7	567.4		601.3
Selling, general and administrative (SG&A)											803.3	768.2	710.7
Non-operating expense – interest expense											499.2	443.7	381.8
Income tax expense											(98.2)	51.1	147.5
Net loss											182.4	635.8	798.7
ASU 2016-02
Assets:
Other assets, net														141.6
Liabilities:
Other long-term liabilities														107.7
Equity:
Other accrued and current liabilities														$ 33.9
Calculated under Revenue Guidance in Effect before Topic 606
Assets:
Other current assets, net													222.9
Other assets, net													517.7
Liabilities:
Current portion of deferred revenue													143.4
Other long-term liabilities													697.8
Equity:
Accumulated deficit													(1,010.7)
Noncontrolling interests													1,361.0
Revenue												3,697.3
Selling, general and administrative (SG&A)												768.9
Non-operating expense – interest expense												424.6
Income tax expense												52.6
Net loss												627.3
Impact of ASU 2014-09 Increase (decrease) | ASU 2014-09
Assets:
Other current assets, net															15.8
Other assets, net															15.6
Liabilities:
Current portion of deferred revenue															13.3
Other long-term liabilities															25.6
Equity:
Revenue												8.4
Selling, general and administrative (SG&A)												(0.7)
Non-operating expense – interest expense												19.1
Income tax expense												(1.5)
Net loss												8.5
Accumulated deficit
Equity:
Accumulated deficit															(1,021.8)
Net loss											80.1	345.2	778.1
Accumulated deficit | Impact of ASU 2014-09 Increase (decrease) | ASU 2014-09
Equity:
Accumulated deficit															(11.1)
Non- controlling interests
Equity:
Noncontrolling interests															1,364.6
Net loss											$ 102.3	$ 290.6	$ 20.6
Non- controlling interests | Impact of ASU 2014-09 Increase (decrease) | ASU 2014-09
Equity:
Noncontrolling interests															$ 3.6