Restructuring and Related Activities - Balance Sheet Location (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Severance and restructuring accrual	$ 7.4	$ 3.8
Other accrued expenses
Restructuring Cost and Reserve [Line Items]
Severance and restructuring accrual	7.2	3.6
Other liabilities
Restructuring Cost and Reserve [Line Items]
Severance and restructuring accrual	$ 0.2	$ 0.2