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Lease Commitments - Minimum Lease Payments (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Leases [Abstract]  
2018 $ 95.9
2019 96.0
2020 92.2
2021 76.5
2022 66.7
Later Years 360.5
Total Minimum Lease Payments 787.8
Less: Sublease Rentals (21.2)
Net Minimum Lease Payments $ 766.6