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Fair Value Measurements - Summary of Changes in the Fair Values of level 3 Assets Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Impairment   $ (9.5) $ (0.4) $ (9.5)
Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, beginning of period $ 17.7 21.6 17.8 0.0
Transfers from Level 2     0.0 21.4
Paid-in-kind dividends     0.1 0.1
Accretion of original purchase discount 0.0 0.3 0.0 0.5
Impairment     (0.4) 0.0
Net valuation gain included in other comprehensive earnings 1.0 1.6 1.2 1.5
Fair Value, end of period $ 18.7 $ 23.5 $ 18.7 $ 23.5