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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and acquisition charges | $ 17.4 | $ 3.4 | $ 5.4 | $ 4.5 | $ 32.6 | $ 18.0 | $ 10.3 | $ 7.6 | $ 30.7 | $ 68.5 | $ 34.1
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  |  |  |  |  |  |  | 6.5 |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  |  |  |  |  |  | (1.9) | (13.5) | (2.4)
Business Combination, Indemnification Assets |  |  |  |  |  |  |  |  |  | 6.5 | 12.8
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  | 31.0 |  |  |  | 8.6 | 31.0 | 8.6 | 7.6
Accruals |  |  |  |  |  |  |  |  | 28.8 | 48.5 | 18.9
Payments made |  |  |  |  |  |  |  |  | (38.5) | (26.1) | (17.9)
Restructuring reserve, ending balance | 21.3 |  |  |  | 31.0 |  |  |  | 21.3 | 31.0 | 8.6
Severance [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  | 19.7 |  |  |  | 2.7 | 19.7 | 2.7 | 3.0
Accruals |  |  |  |  |  |  |  |  | 21.6 | 28.0 | 1.7
Payments made |  |  |  |  |  |  |  |  | (27.1) | (11.0) | (2.0)
Restructuring reserve, ending balance | 14.2 |  |  |  | 19.7 |  |  |  | 14.2 | 19.7 | 2.7
Lease Exit [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  | 5.5 |  |  |  | 5.7 | 5.5 | 5.7 | 4.2
Accruals |  |  |  |  |  |  |  |  | 1.3 | 0.3 | 1.6
Payments made |  |  |  |  |  |  |  |  | (1.1) | (0.5) | (0.1)
Restructuring reserve, ending balance | 5.7 |  |  |  | 5.5 |  |  |  | 5.7 | 5.5 | 5.7
Other Acquisition Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restructuring reserve, beginning balance |  |  |  | $ 5.8 |  |  |  | $ 0.2 | 5.8 | 0.2 | 0.4
Accruals |  |  |  |  |  |  |  |  | 5.9 | 20.2 | 15.6
Payments made |  |  |  |  |  |  |  |  | (10.3) | (14.6) | (15.8)
Restructuring reserve, ending balance | $ 1.4 |  |  |  | $ 5.8 |  |  |  | $ 1.4 | $ 5.8 | $ 0.2

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