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Earnings Per Share and Equity (Schedule of Share Repurchase Program) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 08, 2015
Equity, Class of Treasury Stock [Line Items]
Number of repurchased shares	0	30,400,000	13,900,000
Beginning accrued share repurchases	$ 0.0	$ 0.0	$ 0.6
Aggregate purchase price	0.0	347.8	121.0
Fees, commissions and other expenses	0.0	0.4	0.2
Less: ending accrued share repurchases	0.0	0.0	0.0
Total cash used for share repurchases	$ 0.0	$ 348.2	$ 121.8
Weighted-average purchase price per share (in dollars per share)	$ 0.00	$ 11.46	$ 8.71
Available for future purchases at period end	$ 628.2	$ 628.2	$ 976.0
Share repurchased value		$ 348.2	$ 121.2
1.00% Notes [Member]
Equity, Class of Treasury Stock [Line Items]
Debt instrument, interest rate (as a percent)	1.00%	1.00%
Convertible Debt [Member] | 1.00% Notes [Member]
Equity, Class of Treasury Stock [Line Items]
Number of repurchased shares		5,400,000
Share repurchased value		$ 70.0
Debt instrument, interest rate (as a percent)	1.00%			1.00%

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Accrued Stock Repurchases, Value, Amount

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Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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