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Debt - 2027 Notes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Proceeds from the issuance of senior notes			$ 744.7	$ 0.0	$ 0.0
Loss on extinguishment of debt		$ (21.2)	21.2	0.0	14.3
Debt issuance costs			11.9	$ 0.0	$ 0.0
Senior notes | 2027 Notes
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount			$ 750.0
Stated interest rate			3.80%
Percentage of debt redemption price			99.294%
Debt interest rate, effective percentage			3.885%
Proceeds from the issuance of senior notes	$ 744.7
Debt issuance costs			$ 6.0
Senior notes | 2027 Notes | Prior to June 15, 2027
Debt Instrument [Line Items]
Percentage of debt redemption price			100.00%
Senior notes | 2027 Notes | On or After June 15, 2027
Debt Instrument [Line Items]
Percentage of debt redemption price			100.00%
Senior notes | 2023 Notes
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount	$ 500.0
Stated interest rate			4.75%	4.75%
Percentage of debt redemption price	100.00%
Make-whole premium	$ 17.0
Loss on extinguishment of debt			$ (21.2)
Credit Agreement | Prior Term Loan Facility | Term Loan Facility
Debt Instrument [Line Items]
Long-term debt, aggregate principal amount	$ 500.0

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB
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-SubTopic 30
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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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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