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Debt - 2025 Notes (Details) - USD ($) $ in Millions		1 Months Ended			3 Months Ended	12 Months Ended
	Jan. 05, 2015	Mar. 28, 2015	Nov. 30, 2014	Mar. 31, 2014	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt issuance costs						$ 11.9	$ 0.0	$ 0.0
Cash restricted for use - repurchase of senior notes						0.0	0.0	250.0
Loss on extinguishment of debt					$ (21.2)	$ 21.2	0.0	$ 14.3
Credit Agreement — Term Loan Facility | Term Loan Facility
Debt Instrument [Line Items]
Term loan facility borrowings			$ 500.0
Senior notes | 2025 Notes
Debt Instrument [Line Items]
Proceeds from issuance of debt			650.0
Debt issuance costs			8.4
Senior notes | 2025 Notes | Prior to January 15, 2020
Debt Instrument [Line Items]
Percentage of debt redemption price						100.00%
Senior notes | 2025 Notes | Eagle Ottawa
Debt Instrument [Line Items]
Restricted cash used to finance the acquisition	$ 350.0
Senior notes | 2020 Notes
Debt Instrument [Line Items]
Cash restricted for use - repurchase of senior notes		$ 250.0	250.0
Aggregate principal amount of debt redeemed			$ 245.0
Percentage of debt redemption		104.063%		10.00%
Senior notes | 2020 Notes | Unsecured debt
Debt Instrument [Line Items]
Repayments of senior debt		$ 255.0
Loss on extinguishment of debt							$ 14.3

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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