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Shareholders' Equity Shareholders' Equity (Share Issuance Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 01, 2016
Shares Issuance [Line Items]
Stock Issued During Period, Shares, New Issues	1,822,432	65,550,000
Shares Issued, Price Per Share		$ 9.25
Proceeds from (Repurchase of) Equity		$ 585.5
Debt Instrument, Repurchased Face Amount						$ 24.5
Gain (Loss) on Extinguishment of Debt			$ 287.8	$ (33.5)	$ 0.0
Senior Notes [Member]
Shares Issuance [Line Items]
Debt Instrument, Repurchased Face Amount			1,130.6			24.5
5.75% Senior notes due 2044 | Senior Notes [Member]
Shares Issuance [Line Items]
Debt Instrument, Repurchased Face Amount						$ 24.5
Gain (Loss) on Extinguishment of Debt			$ 8.8

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The net cash inflow or outflow resulting from the entity's share transaction.

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Number of new stock issued during the period.

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