Long-Term and Other Debt - Schedule of Outstanding Debt (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument
Face value	$ 8,178.4
Unamortized debt discount/premium and deferred financing costs, net	(89.6)
Total long-term debt outstanding	8,088.8	$ 8,074.2
Less: current portion of long-term debt	(39.9)	(49.3)
Long-term debt, excluding current portion	8,048.9	8,024.9
Fair value of debt	8,589.5	8,221.8
Senior Notes \| Secured Notes
Debt Instrument
Face value	2,100.0
Unamortized debt discount/premium and deferred financing costs, net	32.4
Total long-term debt outstanding	2,132.4	936.3
Senior Notes \| Unsecured Notes
Debt Instrument
Face value	2,200.0
Unamortized debt discount/premium and deferred financing costs, net	(31.4)
Total long-term debt outstanding	2,168.6	2,164.0
Subordinated Notes \| 2018 Notes
Debt Instrument
Face value	0.0
Unamortized debt discount/premium and deferred financing costs, net	0.0
Total long-term debt outstanding	0.0	248.7
Subordinated Notes \| 2020 Notes
Debt Instrument
Face value	243.5
Unamortized debt discount/premium and deferred financing costs, net	(1.8)
Total long-term debt outstanding	241.7	241.2
Subordinated Notes \| 2021 Notes
Debt Instrument
Face value	340.6
Unamortized debt discount/premium and deferred financing costs, net	(5.0)
Total long-term debt outstanding	$ 335.6	334.5
Capital Lease Obligations
Debt Instrument
Capital lease interest rate	3.90%
Capital Lease Obligations \| Capital lease obligations, 3.9% interest as of September 30, 2017 payable monthly through 2019
Debt Instrument
Face value	$ 11.5
Unamortized debt discount/premium and deferred financing costs, net	0.0
Total long-term debt outstanding	11.5	15.2
Revolving Credit Facility \| Senior Secured Credit Facilities \| Revolver, varying interest rate, due 2018
Debt Instrument
Face value	0.0
Unamortized debt discount/premium and deferred financing costs, net	0.0
Total long-term debt outstanding	0.0	45.0
Revolving Credit Facility \| Senior Secured Credit Facilities \| Revolver, varying interest rate, due 2020
Debt Instrument
Face value	0.0
Unamortized debt discount/premium and deferred financing costs, net	0.0
Total long-term debt outstanding	0.0	0.0
Term Loan Facility \| Senior Secured Credit Facilities \| Term Loan B-1
Debt Instrument
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 Facility \| Senior Secured Credit Facilities \| Term Loan B-2
Debt Instrument
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 Facility \| Senior Secured Credit Facilities \| Term Loan B-3
Debt Instrument
Face value	0.0
Unamortized debt discount/premium and deferred financing costs, net	0.0
Total long-term debt outstanding	0.0	0.0
Term Loan Facility \| Senior Secured Credit Facilities \| Term Loan B-4
Debt Instrument
Face value	3,282.8
Unamortized debt discount/premium and deferred financing costs, net	(83.8)
Total long-term debt outstanding	$ 3,199.0	$ 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
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Contractual interest rate for funds borrowed, under the debt agreement.

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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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