Leases Operating Lease Liabilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 46.2
Right-of-use asset obtained in exchange for operating lease liability	48.0
Operating lease right-of-use assets	150.9
Operating lease liabilities:
Current	31.5
Noncurrent	119.2
Total operating lease liabilities	$ 150.7
Weighted-average remaining lease term	6 years 4 months 24 days
Weighted-average discount rate	6.60%