Leases - Maturities (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating leases maturities:
2019 (excluding the three months ended March 31, 2019)	$ 10.7
2020	8.7
2021	4.6
2022	3.0
2023	2.3
Thereafter	4.4
Total undiscounted minimum lease payments	33.7
Less imputed interest	2.2
Total lease liabilities	31.5
Current lease liabilities (included in other current liabilities)	10.0
Non-Current lease liabilities (included in other non-current liabilities)	21.5
Finance leases maturities:
2019 (excluding the three months ended March 31, 2019)	1.7
2020	1.6
2021	0.5
2022	0.3
Total undiscounted minimum lease payments	4.1
Less imputed interest	0.3
Total lease liabilities	3.8
Current lease liabilities (included in other current liabilities)	1.7
Non-Current lease liabilities (included in other non-current liabilities)	$ 2.1