Segments - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Change in Accounting Estimate [Line Items]
Adjusted EBITDA from continuing operations	$ 216.8	$ 212.9	$ 595.0	$ 592.8
Modified calculation of Adjusted EBITDA to exclude interest income | Restatement Adjustment
Change in Accounting Estimate [Line Items]
Adjusted EBITDA from continuing operations		$ 1.6		$ 5.3