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Stock-Based Compensation Plans Compensation Costs from Equity Awards (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Compensation costs from the Company's stock-based awards $ 17.9 $ 14.3 $ 12.7
Compensation costs related to non-vested awards not yet recognized $ 22.1    
Period over which non-vested awards will be recognized 3 years    
Weighted average period over which non-vested awards will be recognized 1 year 7 months 27 days    
Income tax benefit recognized $ 4.6 4.2 4.4
Total income tax benefit realized from exercise of equity awards $ 2.2 $ 4.1 $ 11.0