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Equity - Share Repurchases, Dividends, Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jul. 20, 2016 | Jan. 01, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Share Repurchase Plan |  |  |  |  |  |
Number of shares authorized by the Board of Directors to be repurchased under share repurchase plan |  |  | 8,400,000 |  | 8,400,000 |
Number of shares authorized by the Board of Directors to be repurchased under share repurchase plan, expressed as a percentage of outstanding shares (as a percent) |  |  | 12.00% |  | 12.00% |
Number of shares repurchased under stock repurchase plan |  |  |  |  | 0 |
Dividends |  |  |  |  |  |
Common stock dividend quarterly declared and paid per share (in dollars per share) |  |  | $ 0.40 | $ 0.40 | $ 0.80 | $ 0.80
Dividends paid |  |  | $ 29.0 | $ 29.7 | $ 57.1 | $ 60.4
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |
Unvested at the beginning of the period (in shares) |  | 900,410 |  |  | 900,410 |
Granted (in shares) |  |  |  |  | 524,746 |
Vested (in shares) |  |  |  |  | (13,317) |
Cancelled (in shares) |  |  |  |  | (19,114) |
Unvested at the end of the period (in shares) |  |  | 1,392,725 |  | 1,392,725 |
Shares reserved for future grants (all plans) |  |  | 1,862,538 |  | 1,862,538 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |
Unvested at the beginning of the period (in dollars per share) |  | $ 63.26 |  |  | $ 63.26 |
Granted (in dollars per shares) |  |  |  |  | 69.20 |
Vested (in dollars per shares) |  |  |  |  | 69.63 |
Cancelled (in dollars per shares) |  |  |  |  | 64.41 |
Unvested at the end of the period (in dollars per shares) |  |  | $ 65.43 |  | $ 65.43 |
Subsequent event |  |  |  |  |  |
Dividends |  |  |  |  |  |
Common stock quarterly dividend per share (in dollars per share) | $ 0.425 |  |  |  |  |
Percentage of increase in common stock dividends declared | 6.30% |  |  |  |  |
Early Adoption | Improvements to Employee Share-Based Payment Accounting |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Cumulative-effect adjustment |  | $ 0.6 |  |  |  |
Common Stock Including Additional Paid in Capital |  |  |  |  |  |
Common Stock and Additional Paid-In (in Shares) |  |  |  |  |  |
Stock-based compensation ( in shares) |  |  | 11,611 |  | 150,162 |
Stock options exercised (in shares) |  |  | 269,575 |  | 614,745 |
Total ( in shares) |  |  | 281,186 |  | 764,907 |
Common Stock and Additional Paid-In (in Amount) |  |  |  |  |  |
Stock-based compensation |  |  | $ 8.1 |  | $ 10.2 |
Stock options exercised |  |  | 13.6 |  | 30.1 |
Cumulative effect of change in accounting for stock-based compensation |  |  |  |  | 1.0 |
Total |  |  | $ 21.7 |  | $ 41.3 |
Weighted Average Exercise/(Purchase) Price |  |  |  |  |  |
Stock options exercised (in dollars per share) |  |  | $ 52.96 |  | $ 49.01 |
Restricted stock |  |  |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 11,851 |
RSU's |  |  |  |  |  |
Dividends |  |  |  |  |  |
Dividend equivalents |  |  |  |  | $ 0.9 | $ 1.0
Stock-Based Compensation |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 3 years |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 512,895 |
RSU's | Performance-based |  |  |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 190,175 |

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