Commitments and Contingencies - Future Minimum Payments Under Non-Cancelable Leases, Sublease Commitments and Related Payments (Details) $ in Millions	Dec. 31, 2016 USD ($)
Payments [Abstract]
2017	$ 138.3
2018	132.3
2019	125.9
2020	105.7
2021	99.2
2022 and thereafter	291.0
Total future minimum payments	892.4
Sublease Receipts [Abstract]
2017	43.3
2018	44.2
2019	43.6
2020	27.2
2021	25.8
2022 and thereafter	66.8
Total future minimum payments receivable	250.9
Net Payments [Abstract]
2017	95.0
2018	88.1
2019	82.3
2020	78.5
2021	73.4
2022 and thereafter	224.2
Total future net minimum payments	$ 641.5