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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2016
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following table categorizes by level in the fair value hierarchy the estimated fair value of our assets and liabilities measured at fair value on a recurring basis.
| December 31,
| 2016 |  | 2015
($ in millions) | Level 2 | Level 3 |  | Level 2 | Level 3
Assets |  |  |  |  |
Foreign currency forward contracts receivable | $ | 8.7 |  | — |  |  | 9.5 |  | — |
Deferred compensation plan assets | 173.0 |  | — |  |  | 134.3 |  | — |
Mortgage banking derivative assets | — |  | 31.4 |  |  | — |  | — |
Total assets at fair value | $ | 181.7 |  | 31.4 |  |  | 143.8 |  | — |
Liabilities |  |  |  |  |
Foreign currency forward contracts payable | $ | 22.9 |  | — |  |  | 21.2 |  | — |
Deferred compensation plan liabilities | 169.5 |  | — |  |  | 129.4 |  | — |
Earn-out liabilities | — |  | 229.6 |  |  | — |  | 127.3 |
Mortgage banking derivative liabilities | — |  | 15.9 |  |  | — |  | — |
Total liabilities at fair value | $ | 192.4 |  | 245.5 |  |  | 150.6 |  | 127.3 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | The tables below presents a reconciliation for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3).
(in millions) | Balance as of December 31, 2015 | Net change in fair value | Foreign currency translation adjustments | Purchases / Additions | Settlements | Balance as of December 31, 2016
Earn-out liabilities | $ | 127.3 |  | 13.5 |  | (8.7 | ) | 103.3 |  | (5.8 | ) | 229.6 |
Mortgage banking derivative assets and liabilities, net | — |  | 6.2 |  | — |  | 22.6 |  | (13.3 | ) | 15.5 |
(in millions) | Balance as of December 31, 2014 | Net change in fair value | Foreign currency translation adjustments | Purchases / Additions | Settlements | Balance as of December 31, 2015
Earn-out liabilities | $ | 25.1 |  | 2.4 |  | (1.8 | ) | 105.1 |  | (3.5 | ) | 127.3 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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