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Long-Term Debt - Senior Notes (Details) - USD ($) $ in Millions		12 Months Ended
	Mar. 02, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt, long-term and short-term		$ 3,255.9	$ 3,267.8
Net loss on extinguishments of long-term debt		(57.4)	(2.1)	$ (24.3)
Deferred finance costs, net		$ 20.4	33.4
Senior notes due 2022
Debt Instrument [Line Items]
Stated interest rate		6.00%
Debt, long-term and short-term	$ 600.0		600.0
Redemption price, percentage	106.182%
Net loss on extinguishments of long-term debt		$ (43.0)
Redemption premium		37.0
Capitalized fees as deferred financing costs		$ 6.0
Deferred finance costs, net			5.6
Senior notes due 2023
Debt Instrument [Line Items]
Stated interest rate		5.00%
Debt, long-term and short-term		$ 525.0	525.0
Deferred finance costs, net		$ 4.5	5.3
Senior notes due 2024
Debt Instrument [Line Items]
Stated interest rate		5.50%
Debt, long-term and short-term		$ 575.0	575.0
Deferred finance costs, net		$ 5.2	$ 6.0
Senior notes due 2025
Debt Instrument [Line Items]
Stated interest rate		5.00%
Debt, long-term and short-term	$ 600.0	$ 600.0
Deferred finance costs, net		$ 7.3

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- Definition

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) and premiums that will be charged against earnings over the life of the debt instruments to which such costs and premiums pertain.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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