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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Amount, after accumulated amortization, of debt premium.

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Gross amount of debt extinguished.

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The amount of cash paid for interest during the period.

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Debt (July 2020 Senior Notes Redemption) (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 15, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Nov. 09, 2010	May 12, 2010
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					6.00%
Interest Paid		$ 357.2	$ 254.7	$ 273.8
Write off of financing fees		$ 35.8	$ 99.6	$ 0.0
Senior Notes \| July 2020 Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage						7.875%
Debt Instrument, Redemption Price, Percentage	103.938%
Extinguishment of Debt, Amount	$ 1,080.0
Interest Paid	39.4
Write off of financing fees	11.1
Debt Instrument, Unamortized Premium	9.7
Redemption Premium \| Senior Notes \| July 2020 Senior Notes
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt	$ 39.4