Commitments and Contingencies (Unrecorded Purchase Obligation) (Details) $ in Millions	Sep. 30, 2017 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2017	$ 1,589.4
2018	2,179.4
2019	1,432.7
2020	861.8
2021	526.8
2022	215.4
Thereafter	1,276.6
Total	8,082.1
Network and Connectivity Commitments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2017	478.2
2018	516.5
2019	378.5
2020	285.2
2021	266.1
2022	74.7
Thereafter	924.7
Total	2,923.9
Programming Commitments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2017	332.6
2018	1,134.3
2019	647.7
2020	282.1
2021	96.9
2022	48.7
Thereafter	63.5
Total	2,605.8
Purchase Commitments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2017	721.9
2018	367.9
2019	283.4
2020	198.0
2021	85.5
2022	25.8
Thereafter	64.3
Total	1,746.8
Operating Leases [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2017	41.4
2018	130.1
2019	108.4
2020	87.2
2021	70.0
2022	57.9
Thereafter	216.3
Total	711.3
Other Commitments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Remainder of 2017	15.3
2018	30.6
2019	14.7
2020	9.3
2021	8.3
2022	8.3
Thereafter	7.8
Total	$ 94.3