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Net (Loss) Income Per Share, Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 18, 2015 | Jul. 01, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Options outstanding to purchase common shares |  | 16,645 | 16,645 |  |  |
Average exercise price per share |  | $ 80.01 | $ 80.01 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  | $ 60.20 | $ 60.44
Payment of cash dividends to stockholders |  | $ 28.1 | $ 25.4 | $ 23.0 |  |
Payment of quarterly cash dividends |  | $ 1.60 | $ 1.40 | $ 1.20 |  |
Cash dividend returned to the Company | $ 0.6 | $ 0.0 | $ 0.0 | $ 0.6 |  |
Shares returned from distribution of third-party trust, shares |  |  |  | 9,001 |  |
Repurchase of common shares pursuant to an authorization from the Board, shares |  | 647,520 | 633,230 | 0 |  |
Weighted-average price of repurchases of common shares |  | $ 76.35 | $ 70.87 |  |  |
Repurchase of common shares pursuant to an authorization from the Board, value |  | $ 49.4 | $ 44.9 | $ 79.3 |  |
Common shares available for additional share repurchase |  | $ 123.3 | $ 72.8 |  |  |
Common Stock |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, Other |  | 1,015,185 |  |  |  |
Shares returned from distribution of third-party trust, shares | 9,001 |  |  |  |  |
Repurchase of common shares pursuant to an authorization from the Board, shares |  | 647,520 | 633,230 | 1,232,077 |  |
Convertible Notes | Convertible Notes Payable |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, Other |  | 1,015,185 |  |  |  |
Warrant Transactions |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Number of common shares underlying the Warrants outstanding |  |  | 3,700,000 |  |  |

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