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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and acquisition charges | $ 32.6 | $ 18.0 | $ 10.3 | $ 7.6 | $ 13.4 | $ 18.1 | $ 1.8 | $ 0.8 | $ 68.5 | $ 34.1 | $ 42.5
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  |  |  |  |  |  | 6.5 |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  |  |  |  |  |  | (13.5) | (2.4) | (3.9)
Business Combination, Indemnification Assets |  |  |  |  |  |  |  |  |  | 12.8 | 34.5
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  | 8.6 |  |  |  | 7.6 | 8.6 | 7.6 | 10.5
Accruals |  |  |  |  |  |  |  |  | 48.5 | 18.9 | 11.9
Payments made |  |  |  |  |  |  |  |  | (26.1) | (17.9) | (14.8)
Restructuring reserve, ending balance | 31.0 |  |  |  | 8.6 |  |  |  | 31.0 | 8.6 | 7.6
Severance [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  | 2.7 |  |  |  | 3.0 | 2.7 | 3.0 | 3.8
Accruals |  |  |  |  |  |  |  |  | 28.0 | 1.7 | 5.2
Payments made |  |  |  |  |  |  |  |  | (11.0) | (2.0) | (6.0)
Restructuring reserve, ending balance | 19.7 |  |  |  | 2.7 |  |  |  | 19.7 | 2.7 | 3.0
Retention Bonuses [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0 | 0.4
Accruals |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Payments made |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.4)
Restructuring reserve, ending balance | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Lease Exit [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  | 5.7 |  |  |  | 4.2 | 5.7 | 4.2 | 5.9
Accruals |  |  |  |  |  |  |  |  | 0.3 | 1.6 | 3.2
Payments made |  |  |  |  |  |  |  |  | (0.5) | (0.1) | (4.9)
Restructuring reserve, ending balance | 5.5 |  |  |  | 5.7 |  |  |  | 5.5 | 5.7 | 4.2
Other Acquisition Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  | $ 0.2 |  |  |  | $ 0.4 | 0.2 | 0.4 | 0.4
Accruals |  |  |  |  |  |  |  |  | 20.2 | 15.6 | 3.5
Payments made |  |  |  |  |  |  |  |  | (14.6) | (15.8) | (3.5)
Restructuring reserve, ending balance | $ 5.8 |  |  |  | $ 0.2 |  |  |  | 5.8 | $ 0.2 | $ 0.4
LaSalle [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  |  |  |  |  |  | $ 6.5 |  |

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