Segment Information - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Millions |
Sep. 30, 2015 |
Dec. 31, 2014 |
---|---|---|
Segment Reporting Information [Line Items] | ||
Total assets | $ 4,010.3 | $ 4,023.6 |
Operating segments | U.S. | ||
Segment Reporting Information [Line Items] | ||
Total assets | 3,675.1 | 3,704.2 |
Operating segments | International | ||
Segment Reporting Information [Line Items] | ||
Total assets | 244.7 | 270.4 |
Corporate | ||
Segment Reporting Information [Line Items] | ||
Total assets | $ 90.5 | $ 49.0 |