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Equity Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Allocated Share-based Compensation Expense | $ 16.0 | $ 24.4 | $ 20.3
Options, Exercises in Period, Total Intrinsic Value | $ 26.2 | $ 17.0 | $ 11.3
Performance Contingent Units Measurement Period | 3 years |  |
Performance Contingent Unit Share Payout | 0.8203 | 0.529 |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized | $ 30.5 |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition | 2 years 1 month |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options, Grants in Period, Weighted Average Exercise Price | $ 91.65 | $ 78.48 | $ 58.77
Stock Options [Member] |  |  |
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | 652,015,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration Period | 10 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 506,344,000 |  |
Options, Grants in Period, Weighted Average Exercise Price | $ 91.65 |  |
Flexible Stock Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number Of Shares Available For Grant | 13,360,077 |  |
Flexible Stock Plan For Directors [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number Of Shares Available For Grant | 212,500 |  |
Performance Shares [Member] |  |  |
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | 192,725 | 103,358 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 185,783 |  |
Options, Grants in Period, Weighted Average Exercise Price | $ 90.15 |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 37,078 |  |
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting Period | 1 year |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting Period | 5 years |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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