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Equity Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  |  |  |  | $ 20.3 | $ 28.5 | $ 23.1
Options, Exercises in Period, Total Intrinsic Value |  |  |  |  |  |  |  |  | 11.3 | 11.2 | 12.5
Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  | $ 18.58 | $ 19.65 | $ 22.73
Fair Value Assumptions, Expected Dividend Rate |  |  |  |  |  |  |  |  | 1.63% | 1.27% | 0.80%
Fair Value Assumptions, Risk Free Interest Rate |  |  |  |  |  |  |  |  | 1.36% | 1.38% | 2.81%
Fair Value Assumptions, Expected Term |  |  |  |  |  |  |  |  | 6 years 9 months 20 days | 6 years 8 months 12 days | 6 years 8 months 15 days
Fair Value Assumptions, Expected Volatility Rate |  |  |  |  |  |  |  |  | 35.40% | 37.20% | 35.00%
Performance Contingent Units Outstanding |  |  |  |  |  |  |  |  | 257,628 | 247,147 | 207,566
Performance Contingent Units Maximum Shares of Common Stock Per PCU |  |  |  |  |  |  |  |  | 2 |  |
Performance Contingent Units Measurement Period |  |  |  |  |  |  |  |  | 3 years |  |
Performance Contingent Unit Share Payout |  |  |  |  |  |  |  |  | 1.513 | 1.31 |
Performance Contingent Units Shares of Common Stock Issued |  |  |  |  |  |  |  |  | 339,483 | 362,642 |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized | $ 27.3 |  |  |  |  |  |  |  | $ 27.3 |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  | 1 year 10 months 24 days |  |
Equity Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic (in dollars per share) | $ 2.05 | $ 1.95 | $ (0.69) | $ 2.51 | $ 3.02 | $ 1.96 | $ 1.91 | $ 1.68 | $ 5.82 | $ 8.57 | $ 7.42
Options, Grants in Period, Weighted Average Exercise Price |  |  |  |  |  |  |  |  | $ 58.77 | $ 56.65 | $ 59.74
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expiration Period |  |  |  |  |  |  |  |  | 10 years |  |
Options, Grants in Period, Net of Forfeitures |  |  |  |  |  |  |  |  | 748,577,000 | 685,331,000 | 503,259,000
Flexible Stock Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number Of Shares Available For Grant | 13,360,077 |  |  |  |  |  |  |  | 13,360,077 |  |
Flexible Stock Plan For Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number Of Shares Available For Grant | 212,500 |  |  |  |  |  |  |  | 212,500 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options, Grants in Period, Net of Forfeitures |  |  |  |  |  |  |  |  | 261,322 | 257,679 | 222,580
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Based Compensation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting Period |  |  |  |  |  |  |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Equity Based Compensation [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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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 Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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