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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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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