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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Expense
Stock-based compensation cost by award type follows:
(in millions)Three Months Ended
March 31,
20192018
Stock option awards$3.1 $2.0 
Restricted stock awards2.0 1.9 
Performance share awards1.6 1.7 
Restricted stock units1.3 1.4 
Stock appreciation rights0.8 — 
Total stock-based compensation cost$8.8 $7.0