Long-Term and Other Debt - Outstanding Debt (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Face Value	$ 8,869.4
Unamortized debt discount/premium and deferred financing costs, net	(92.8)
Total long-term debt outstanding	8,776.6	$ 8,074.2
Less: current portion of long-term debt	(40.3)	(49.3)
Long-term debt, excluding current portion	8,736.3	8,024.9
Debt instrument, fair value	9,251.5
Senior Notes
Debt Instrument [Line Items]
Face Value	$ 4,650.0
Senior Notes \| Senior Secured Notes, maturing 2022
Debt Instrument [Line Items]
Debt Instrument, interest rate, stated percentage	7.00%
Face Value	$ 2,100.0
Unamortized debt discount/premium and deferred financing costs, net	30.7
Total long-term debt outstanding	$ 2,130.7	936.3
Senior Notes \| Senior Secured Notes, maturing 2025
Debt Instrument [Line Items]
Debt Instrument, interest rate, stated percentage	5.00%
Face Value	$ 350.0
Unamortized debt discount/premium and deferred financing costs, net	(6.3)
Total long-term debt outstanding	$ 343.7	0.0
Senior Notes \| Senior Unsecured Notes, maturing 2022
Debt Instrument [Line Items]
Debt Instrument, interest rate, stated percentage	10.00%
Face Value	$ 2,200.0
Unamortized debt discount/premium and deferred financing costs, net	(29.9)
Total long-term debt outstanding	2,170.1	2,164.0
Senior Subordinated Notes
Debt Instrument [Line Items]
Face Value	$ 584.1
Senior Subordinated Notes \| Senior Subordinated Notes, maturing 2018
Debt Instrument [Line Items]
Debt Instrument, interest rate, stated percentage	8.125%
Face Value	$ 0.0
Unamortized debt discount/premium and deferred financing costs, net	0.0
Total long-term debt outstanding	$ 0.0	248.7
Senior Subordinated Notes \| Senior Subordinated Notes, maturing 2020
Debt Instrument [Line Items]
Debt Instrument, interest rate, stated percentage	6.25%
Face Value	$ 243.5
Unamortized debt discount/premium and deferred financing costs, net	(1.7)
Total long-term debt outstanding	$ 241.8	241.2
Senior Subordinated Notes \| Senior Subordinated Notes, maturing 2021
Debt Instrument [Line Items]
Debt Instrument, interest rate, stated percentage	6.625%
Face Value	$ 340.6
Unamortized debt discount/premium and deferred financing costs, net	(4.6)
Total long-term debt outstanding	336.0	334.5
Capital Lease Obligations
Debt Instrument [Line Items]
Face Value	$ 10.7
Capital Lease Obligations \| Capital lease obligations, 3.9% as of December 31, 2017 payable monthly through 2019
Debt Instrument [Line Items]
Debt Instrument, interest rate, stated percentage	3.90%
Face Value	$ 10.7
Unamortized debt discount/premium and deferred financing costs, net	0.0
Total long-term debt outstanding	10.7	15.2
Revolver \| Secured Debt \| Senior Secured Revolver, maturing 2018
Debt Instrument [Line Items]
Face Value	100.5
Unamortized debt discount/premium and deferred financing costs, net	0.0
Total long-term debt outstanding	100.5	45.0
Revolver \| Secured Debt \| Senior Secured Revolver, maturing 2020
Debt Instrument [Line Items]
Face Value	249.5
Unamortized debt discount/premium and deferred financing costs, net	0.0
Total long-term debt outstanding	249.5	0.0
Term Loan \| Secured Debt \| Senior Secured Term Loan B-1, maturing 2020
Debt Instrument [Line Items]
Face Value	0.0
Unamortized debt discount/premium and deferred financing costs, net	0.0
Total long-term debt outstanding	0.0	2,183.5
Term Loan \| Secured Debt \| Senior Secured Term Loan B-2, maturing 2021
Debt Instrument [Line Items]
Face Value	0.0
Unamortized debt discount/premium and deferred financing costs, net	0.0
Total long-term debt outstanding	0.0	1,905.8
Term Loan \| Secured Debt \| Senior Secured Term Loan B-4, maturing 2024
Debt Instrument [Line Items]
Face Value	3,274.6
Unamortized debt discount/premium and deferred financing costs, net	(81.0)
Total long-term debt outstanding	$ 3,193.6	$ 0.0

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of unamortized debt discount (premium) and debt issuance costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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