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Commitments (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases

Future minimum rental payments for operating leases with initial or remaining terms in excess of one year are as follows as of December 31, 2017 (in millions):

 

2018

 

2019

 

2020

 

2021

 

2022

 

Thereafter

 

Total

$215.4

  $178.8   $140.1   $114.0   $95.3   $324.7   $1,068.3