Leases - Future Minimum Lease Payment Obligations Under Operating Leases (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Leases [Abstract]
Document Period End Date	Jun. 30, 2019
2019	$ 11.7
2020	22.0
2021	19.0
2022	16.2
2023	13.8
2024	11.3
Thereafter	53.6
Total future minimum operating lease payments	147.6
Imputed interest	36.5
Present value of lease liabilities reported	$ 111.1