Stock and Other Incentive Plans - Amortization of Compensation for Nonvested Shares (Details) $ in Millions	Dec. 31, 2016 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
2017	$ 8.8
2018	6.7
2019	4.6
2020	4.4
2021	3.4
2022 and thereafter	4.3
Total	$ 32.2