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Fair Value Measurements - Schedule of Changes in Level 3 Assets (Details) - Other Investments - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 133.8 $ 135.9 $ 134.2 $ 131.8
Net gains/losses [1] 2.4 5.1 (1.8) 10.9
Purchases and issuances 3.7 3.1 6.2 6.9
Settlements and reductions (6.5) (4.6) (11.7) (10.1)
Net transfers in and/or out of Level 3 0.0 0.0 6.5 0.0
Balance, end of period 133.4 139.5 133.4 139.5
Net unrealized gains/losses relating to instruments still held at the reporting date [1] $ 4.8 $ 5.8 $ 3.6 $ 12.7
[1] Gains and losses on Other investments are recorded in Investment and other income.