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Restructuring and Acquisition Charges (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]          
Restructuring and acquisition charges $ 18.0   $ 18.2 $ 35.9 $ 20.8
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability       (1.5)  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 6.5     6.5  
Loss on foreign currency derivative, acquisition payment 2.3        
Gain on foreign currency derivative, acquisition payment   $ 2.3      
Business Combination, Indemnification Assets     12.8   12.8
Restructuring reserve [Roll Forward]          
Restructuring reserve, beginning balance       8.6 7.6
Restructuring charges       30.9 8.0
Payments made       (16.9) (9.1)
Restructuring reserve, ending balance 22.6   6.5 22.6 6.5
Severance [Member]          
Restructuring reserve [Roll Forward]          
Restructuring reserve, beginning balance       2.7 3.0
Restructuring charges       16.0 (0.1)
Payments made       (5.1) (1.9)
Restructuring reserve, ending balance 13.6   1.0 13.6 1.0
Lease Exit [Member]          
Restructuring reserve [Roll Forward]          
Restructuring reserve, beginning balance       5.7 4.2
Restructuring charges       0.0 0.2
Payments made       (0.4) (2.7)
Restructuring reserve, ending balance 5.3   1.7 5.3 1.7
Other Acquisition Costs [Member]          
Restructuring reserve [Roll Forward]          
Restructuring reserve, beginning balance       0.2 0.4
Restructuring charges       14.9 7.9
Payments made       (11.4) (4.5)
Restructuring reserve, ending balance $ 3.7   $ 3.8 3.7 $ 3.8
Investment Management [Member]          
Restructuring Cost and Reserve [Line Items]          
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)       $ 6.5