Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest Expense [Abstract]
Interest expense - long-term debt	$ 69.1	$ 82.9	$ 145.2	$ 176.7
Interest expense - long-term lease obligation - Real estate contributed to pension plan	1.6	1.5	3.1	3.1
Impact of interest rate swaps	(3.3)	(3.0)	(6.6)	(5.9)
Interest on capital leases and other	0.6	1.4	1.4	2.3
Less capitalized interest expense	(2.0)	(2.0)	(4.0)	(3.5)
Total interest expense	$ 66.0	$ 80.8	$ 139.1	$ 172.7