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Commitments and Contingencies - Minimum Lease Payments (Details) $ in Millions	Dec. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2019	$ 43.6
2020	40.6
2021	38.3
2022	35.8
2023	29.8
Thereafter	276.8
Total minimum lease payments	464.9
Less: sublease rentals	(10.3)
Future minimum payments, net	$ 454.6

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