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Summary of Significant Accounting Policies - Maturities of Lease Liabilities, Topic 842 (Details) $ in Millions	Mar. 31, 2019 USD ($)
Finance Leases
2019	$ 1.4
2020	1.6
2021	1.6
2022	1.0
2023	0.0
Thereafter	0.0
Total lease payments	5.6
Less imputed interest	0.2
Total	5.4
Operating Leases
2019	40.4
2020	47.0
2021	28.9
2022	17.8
2023	20.7
Thereafter	6.6
Total lease payments	161.4
Less imputed interest	18.3
Total	$ 143.1

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